1
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Rajput S, Sahoo RK, Sarkar N, Nembenna S. Gallium Hydride-Catalyzed Selective Hydroboration of Unsaturated Organic Substrates. Chempluschem 2024; 89:e202300737. [PMID: 38437065 DOI: 10.1002/cplu.202300737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 03/04/2024] [Accepted: 03/04/2024] [Indexed: 03/06/2024]
Abstract
The first examples of tetrasubstituted conjugated bis-guanidinate (CBG) supported monomeric and thermally stable gallium dihalides [LGaX2], (X=Cl (Ga-Cl), I (Ga-I)) and dihydride (Ga-H) [LGaH2] (where L={(ArHN)(ArN)-C=N-C=(NAr)(NHAr)}; Ar=2,6-Et2-C6H3) compounds are reported. The reaction of in situ generated LLi with 1.0 equiv. GaX3 (X=Cl, I) afforded compounds Ga-Cl and Ga-I. The reaction between Ga-Cl and Li[HBEt3] in benzene yielded the dihydride compound Ga-H. All reported compounds (Ga-Cl, Ga-I, and Ga-H) were characterized by NMR, HRMS, and single-crystal X-ray diffraction studies. Ga-H was probed for the hydroboration of carbodiimides (CDI), isocyanates, and isothiocyanates with HBpin. Compound Ga-H was also found effective for the catalytic hydroboration of imines, nitriles, alkynes, esters, and formates, affording the corresponding products in quantitative yields. Stoichiometric reactions with a CDI were performed to establish the catalytic cycle.
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Affiliation(s)
- Sagrika Rajput
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
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2
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Janda BA, Tran JA, Chang DK, Nerhood GC, Maduka Ogba O, Liberman-Martin AL. Carbodiimide and Isocyanate Hydroboration by a Cyclic Carbodiphosphorane Catalyst. Chemistry 2024; 30:e202303095. [PMID: 37847813 DOI: 10.1002/chem.202303095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 10/13/2023] [Accepted: 10/17/2023] [Indexed: 10/19/2023]
Abstract
We report hydroboration of carbodiimide and isocyanate substrates catalyzed by a cyclic carbodiphosphorane catalyst. The cyclic carbodiphosphorane outperformed the other Lewis basic carbon species tested, including other zerovalent carbon compounds, phosphorus ylides, an N-heterocyclic carbene, and an N-heterocyclic olefin. Hydroborations of seven carbodiimides and nine isocyanates were performed at room temperature to form N-boryl formamidine and N-boryl formamide products. Intermolecular competition experiments demonstrated the selective hydroboration of alkyl isocyanates over carbodiimide and ketone substrates. DFT calculations support a proposed mechanism involving activation of pinacolborane by the carbodiphosphorane catalyst, followed by hydride transfer and B-N bond formation.
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Affiliation(s)
- Ben A Janda
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, 450 North Center Street, Orange, CA 92866, USA
| | - Julie A Tran
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, 450 North Center Street, Orange, CA 92866, USA
| | - Daniel K Chang
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, 450 North Center Street, Orange, CA 92866, USA
| | - Gabriela C Nerhood
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, 450 North Center Street, Orange, CA 92866, USA
| | - O Maduka Ogba
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, 450 North Center Street, Orange, CA 92866, USA
| | - Allegra L Liberman-Martin
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, 450 North Center Street, Orange, CA 92866, USA
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3
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Malik M, Senatore R, Langer T, Holzer W, Pace V. Base-mediated homologative rearrangement of nitrogen-oxygen bonds of N-methyl- N-oxyamides. Chem Sci 2023; 14:10140-10146. [PMID: 37772102 PMCID: PMC10530184 DOI: 10.1039/d3sc03216g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Accepted: 08/26/2023] [Indexed: 09/30/2023] Open
Abstract
Due to the well known reactivity of C(O)-N functionalities towards canonical C1-homologating agents (e.g. carbenoids, diazomethane, ylides), resulting in the extrusion of the N-centered fragment en route to carbonyl compounds, formal C1-insertions within N-O bonds still remain obscure. Herein, we document the homologative transformation of N-methyl-N-oxyamides - with high tolerance for diverse O-substituents - into N-acyl-N,O-acetals. Under controlled basic conditions, the N-methyl group of the same starting materials acts as a competent precursor of the methylene synthon required for the homologation. The logic is levered on the formation of an electrophilic iminium ion (via N-O heterolysis) susceptible to nucleophilic attack by the alkoxide previously expulsed. The procedure documents genuine chemocontrol and flexibility, as judged by the diversity of substituents placed on both amide and nitrogen linchpins. The mechanistic rationale was validated through experiments conducted on D-labeled materials which unambiguously attributed the origin of the methylene fragment to the N-methyl group of the starting compounds.
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Affiliation(s)
- Monika Malik
- Department of Pharmaceutical Sciences, Division of Pharmaceutical Chemistry, University of Vienna Josef-Holaubek-Platz 2 1090 Vienna Austria
| | - Raffaele Senatore
- Department of Pharmaceutical Sciences, Division of Pharmaceutical Chemistry, University of Vienna Josef-Holaubek-Platz 2 1090 Vienna Austria
| | - Thierry Langer
- Department of Pharmaceutical Sciences, Division of Pharmaceutical Chemistry, University of Vienna Josef-Holaubek-Platz 2 1090 Vienna Austria
| | - Wolfgang Holzer
- Department of Pharmaceutical Sciences, Division of Pharmaceutical Chemistry, University of Vienna Josef-Holaubek-Platz 2 1090 Vienna Austria
| | - Vittorio Pace
- Department of Pharmaceutical Sciences, Division of Pharmaceutical Chemistry, University of Vienna Josef-Holaubek-Platz 2 1090 Vienna Austria
- Department of Chemistry, University of Turin Via Giuria 7 10125 Turin Italy
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4
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Kumar R, Sharma V, Banerjee S, Vanka K, Sen SS. Controlled reduction of isocyanates to formamides using monomeric magnesium. Chem Commun (Camb) 2023; 59:2255-2258. [PMID: 36748261 DOI: 10.1039/d3cc00036b] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
This work describes a transition metal-free methodology involving an efficient and controlled reduction of isocyanates to only formamide derivatives using pinacolborane (HBpin) as the hydrogenating agent and a bis(phosphino)carbazole ligand stabilized magnesium methyl complex (1) as the catalyst. A large number of substrates undergo selective hydroboration and give exclusively N-boryl formamides.
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Affiliation(s)
- Rohit Kumar
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pashan, Pune 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), New Ghaziabad 201002, India
| | - Vishal Sharma
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pashan, Pune 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), New Ghaziabad 201002, India
| | - Subhrashis Banerjee
- Academy of Scientific and Innovative Research (AcSIR), New Ghaziabad 201002, India.,Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pashan, Pune 411008, India
| | - Kumar Vanka
- Academy of Scientific and Innovative Research (AcSIR), New Ghaziabad 201002, India.,Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pashan, Pune 411008, India
| | - Sakya S Sen
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pashan, Pune 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), New Ghaziabad 201002, India
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5
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English LE, Horsley Downie TM, Lyall CL, Mahon MF, McMullin CL, Neale SE, Saunders CM, Liptrot DJ. Selective hydroboration of electron-rich isocyanates by an NHC-copper(I) alkoxide. Chem Commun (Camb) 2023; 59:1074-1077. [PMID: 36621804 DOI: 10.1039/d2cc04742j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The (IPr)CuOtBu catalysed reduction of 11 aryl and alkyl isocyanates with pinacolborane gave only the boraformamides, pinBN(R)C(O)H, in most cases. Overreduction, which hampers almost all isocyanate hydroborations, was restricted to electron poor aryl isocyanates (4-NC-C6H4NCO, 4-F3C-C6H4NCO, 3-O2N-C6H4NCO). Computational analysis showed stability of [(IPr)CuH]2, which was proposed to be the catalyst resting state, drives selectivity, suggesting an approach to prevent overreduction in future work. In the case of iPrNCO, formation of this species renders overreduction kinetically inaccessible. For 4-NC-C6H4NCO, however, the barrier height for the first step of over-reduction is much lower, even relative to [(IPr)CuH]2, resulting in unselective reduction.
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Affiliation(s)
- Laura E English
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK. .,Centre for Sustainable and Circular Technologies, Bath, BA2 7AY, UK
| | | | | | - Mary F Mahon
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK.
| | | | - Samuel E Neale
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK.
| | | | - David J Liptrot
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK.
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6
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Ni C, Ma X, Yang Z, Roesky HW. Chemoselective Hydroboration of Isocyanates Catalyzed by Commercially Available NaH. ChemistrySelect 2022. [DOI: 10.1002/slct.202202878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Congjian Ni
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
| | - Xiaoli Ma
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
| | - Zhi Yang
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
| | - Herbert W. Roesky
- Institute of Inorganic Chemistry Georg-August-Universität Tammannstrasse 4 D-37077 Göttingen Germany
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7
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Gudun KA, Tussupbayev S, Slamova A, Khalimon AY. Hydroboration of isocyanates: cobalt-catalyzed vs. catalyst-free approaches. Org Biomol Chem 2022; 20:6821-6830. [PMID: 35968649 DOI: 10.1039/d2ob01192a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydroboration of isocyanates with HBPin was demonstrated using both catalytic and catalyst-free approaches. In arene solvents, the reactions employed the commercially available and bench-stable Co(acac)2/dpephos (dpephos = bis[(2-diphenylphosphino)phenyl] ether) pre-catalyst and proved chemodivergent, showing the formation of either formamides or N-methylamines, depending on the concentration of HBPin and the reaction conditions used. Catalytic monohydroboration of isocyanates to formamides was found to be highly chemoselective, tolerating alkenes, alkynes, aryl halides, esters, carboxamides, nitriles, nitroarenes and heteroaromatic functionalities. The catalyst-free hydroboration reactions have been demonstrated in neat HBPin. Whereas monohydroboration proved less selective compared with Co(acac)2/dpephos-catalyzed transformations, selective deoxygenative hydroboration of isocyanates to N-methylamines was observed under catalyst-free conditions.
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Affiliation(s)
- Kristina A Gudun
- Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, 53 Kabanbay Batyr. Avenue, Nur-Sultan 010000, Kazakhstan.
| | - Samat Tussupbayev
- Institute of Polymer Materials and Technologies, 3/1 Atyrau 1, Almaty 050019, Kazakhstan
| | - Ainur Slamova
- Core Facilities, Office of the Provost, Nazarbayev University, 53 Kabanbay Batyr. Avenue, Nur-Sultan 010000, Kazakhstan
| | - Andrey Y Khalimon
- Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, 53 Kabanbay Batyr. Avenue, Nur-Sultan 010000, Kazakhstan. .,The Environment and Resource Efficiency Cluster (EREC), Nazarbayev University, 53 Kabanbay Batyr. Avenue, Nur-Sultan 010000, Kazakhstan
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8
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Young Kim S, Ri Kim Y, Tae Kim H, Kumar Jaladi A, Keun An D. Diisobutyl(morpholino)aluminum‐Enabled Partial Reductions with DIBALH: Highly Practical Synthesis of Aldehydes from Carboxylic Acid Derivatives. ChemistrySelect 2022. [DOI: 10.1002/slct.202202351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- So Young Kim
- Department of Chemistry and Institute for Molecular Science and Fusion Technology Kangwon National University Cuncheon 24341 Republic of Korea
| | - Yu Ri Kim
- Department of Chemistry and Institute for Molecular Science and Fusion Technology Kangwon National University Cuncheon 24341 Republic of Korea
| | - Hyun Tae Kim
- Department of Chemistry and Institute for Molecular Science and Fusion Technology Kangwon National University Cuncheon 24341 Republic of Korea
| | - Ashok Kumar Jaladi
- Department of Chemistry and Institute for Molecular Science and Fusion Technology Kangwon National University Cuncheon 24341 Republic of Korea
| | - Duk Keun An
- Department of Chemistry and Institute for Molecular Science and Fusion Technology Kangwon National University Cuncheon 24341 Republic of Korea
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9
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Bayzidi M, Zeynizadeh B. A uniformly anchored zirconocene complex on magnetic reduced graphene oxide (rGO@Fe 3O 4/ZrCp 2Cl x (x = 0, 1, 2)) as a novel and reusable nanocatalyst for synthesis of N-arylacetamides and reductive-acetylation of nitroarenes. RSC Adv 2022; 12:15020-15037. [PMID: 35702429 PMCID: PMC9112892 DOI: 10.1039/d2ra02293a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 05/09/2022] [Indexed: 11/21/2022] Open
Abstract
In this study, a crafted zirconocene complex on rGO@Fe3O4 as a novel magnetic nanocatalyst was synthesized and then characterized using FT-IR, SEM, EDX, VSM, ICP-OES, TGA, BET and MS analyses. Next, catalytic activity of the prepared nanocomposite rGO@Fe3O4/ZrCp2Cl x (x = 0, 1, 2) towards successful reduction of aromatic nitro compounds to arylamines using N2H4·H2O (80%) was investigated. The examined nanocatalyst also showed perfect catalytic activity for reductive-acetylation of aromatic nitro compounds to the corresponding N-arylacetamides without isolation of the prepared in situ amines using the N2H4·H2O/Ac2O system. Furthermore, acetylation of the commercially available arylamines to the corresponding N-arylacetamides was carried out by acetic anhydride in the presence of the rGO@Fe3O4/ZrCp2Cl x (x = 0, 1, 2) nanocomposite. All reactions were carried out in refluxing EtOH as a green solvent to afford the products in high yields. The obtained results exhibited that the nanocomposite of rGO@Fe3O4/ZrCp2Cl x (x = 0, 1, 2) showed a great catalytic activity in comparison to rGO and rGO@Fe3O4 as the parent constituents. Recovery and reusability of rGO@Fe3O4/ZrCp2Cl x (x = 0, 1, 2) were also examined for 8 consecutive cycles without significant loss of the catalytic activity. This establishes the sustainable anchoring of the zirconocene complex on the surface and mesopores of the rGO@Fe3O4 nanohybrid system.
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Affiliation(s)
- Massood Bayzidi
- Department of Chemistry, Urmia University Urmia 5756151818 Iran
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10
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Pandey VK, Sahoo S, Rit A. Simple silver(I)-salt catalyzed selective hydroboration of isocyanates, pyridines, and quinolines. Chem Commun (Camb) 2022; 58:5514-5517. [PMID: 35420096 DOI: 10.1039/d2cc00491g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
AgSbF6 has been established as an effective catalyst for the hydroboration of structurally and electronically diverse isocyanates under ligand- and solvent-free conditions which selectively yielded either N-boryl formamides or N-boryl methylamines under different conditions. Further, various N-heterocycles can be selectively hydroborated using this simple catalytic system; pyridine derivatives undergo preferential 1,4 hydroboration whereas the formation of tetrahydroquinoline (after hydrolysis) via complete heterocycle hydrogenation was observed for quinolines.
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Affiliation(s)
- Vipin K Pandey
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Sangita Sahoo
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Arnab Rit
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
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11
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Jordan A, Hall CGJ, Thorp LR, Sneddon HF. Replacement of Less-Preferred Dipolar Aprotic and Ethereal Solvents in Synthetic Organic Chemistry with More Sustainable Alternatives. Chem Rev 2022; 122:6749-6794. [PMID: 35201751 PMCID: PMC9098182 DOI: 10.1021/acs.chemrev.1c00672] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Dipolar aprotic and ethereal solvents comprise just over 40% of all organic solvents utilized in synthetic organic, medicinal, and process chemistry. Unfortunately, many of the common "go-to" solvents are considered to be "less-preferable" for a number of environmental, health, and safety (EHS) reasons such as toxicity, mutagenicity, carcinogenicity, or for practical handling reasons such as flammability and volatility. Recent legislative changes have initiated the implementation of restrictions on the use of many of the commonly employed dipolar aprotic solvents such as dimethylformamide (DMF) and N-methyl-2-pyrrolidinone (NMP), and for ethers such as 1,4-dioxane. Thus, with growing legislative, EHS, and societal pressures, the need to identify and implement the use of alternative solvents that are greener, safer, and more sustainable has never been greater. Within this review, the ubiquitous nature of dipolar aprotic and ethereal solvents is discussed with respect to the physicochemical properties that have made them so appealing to synthetic chemists. An overview of the current legislative restrictions being imposed on the use of dipolar aprotic and ethereal solvents is discussed. A variety of alternative, safer, and more sustainable solvents that have garnered attention over the past decade are then examined, and case studies and examples where less-preferable solvents have been successfully replaced with a safer and more sustainable alternative are highlighted. Finally, a general overview and guidance for solvent selection and replacement are included in the Supporting Information of this review.
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Affiliation(s)
- Andrew Jordan
- School of Chemistry, University of Nottingham, GlaxoSmithKline Carbon Neutral Laboratory, 6 Triumph Road, Nottingham, NG7 2GA, U.K
| | - Callum G J Hall
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, Glasgow, Scotland G1 1XL, U.K.,GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Lee R Thorp
- GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Helen F Sneddon
- Green Chemistry Centre of Excellence, University of York, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
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12
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Abstract
Recent advances in partial reductions of inert carboxylic acids and their derivatives to active aldehydes are reviewed.
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Affiliation(s)
- Zhanhui Yang
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China
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13
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14
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Klimochkin YN, Ivleva EA. N-Substituted S-Alkyl Carbamothioates in the Synthesis of Nitrogen-containing Functional Derivatives of the Adamantane Series. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [PMCID: PMC8473989 DOI: 10.1134/s1070428021080078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of new asymmetric ureas, urethanes, and other derivatives of the framework structure have been synthesized by the reactions of adamantan-1-yl isocyanate generated in situ by the thermolysis of carbamothioates with nitrogen-containing nucleophiles and alcohols.
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Affiliation(s)
| | - E. A. Ivleva
- Samara State Technical University, 443100 Samara, Russia
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15
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Kumar A, Sharma P, Sharma N, Kumar Y, Mahajan D. Catalyst free N-formylation of aromatic and aliphatic amines exploiting reductive formylation of CO 2 using NaBH 4. RSC Adv 2021; 11:25777-25787. [PMID: 35478907 PMCID: PMC9037105 DOI: 10.1039/d1ra04848a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 07/20/2021] [Indexed: 11/29/2022] Open
Abstract
Herein, we report a sustainable approach for N-formylation of aromatic as well as aliphatic amines using sodium borohydride and carbon dioxide gas. The developed approach is catalyst free, and does not need pressure or a specialized reaction assembly. The reductive formylation of CO2 with sodium borohydride generates formoxy borohydride species in situ, as confirmed by 1H and 11B NMR spectroscopy. The in situ formation of formoxy borohydride species is prominent in formamide based solvents and is critical for the success of the N-formylation reactions. The formoxy borohydride is also found to promote transamidation reactions as a competitive pathway along with reductive functionalization of CO2 with amine leading to N-formylation of amines. Herein, we report a sustainable approach for N-formylation of aromatic as well as aliphatic amines using sodium borohydride and carbon dioxide gas.![]()
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Affiliation(s)
- Arun Kumar
- Medicinal Chemistry and Pharmacology Lab, Translational Health Science and Technology Institute (THSTI), NCR Biotech Science Cluster 3rd Milestone Faridabad-Gurgaon Expressway Faridabad-121001 India
| | - Pankaj Sharma
- Medicinal Chemistry and Pharmacology Lab, Translational Health Science and Technology Institute (THSTI), NCR Biotech Science Cluster 3rd Milestone Faridabad-Gurgaon Expressway Faridabad-121001 India
| | - Nidhi Sharma
- Medicinal Chemistry and Pharmacology Lab, Translational Health Science and Technology Institute (THSTI), NCR Biotech Science Cluster 3rd Milestone Faridabad-Gurgaon Expressway Faridabad-121001 India
| | - Yashwant Kumar
- Medicinal Chemistry and Pharmacology Lab, Translational Health Science and Technology Institute (THSTI), NCR Biotech Science Cluster 3rd Milestone Faridabad-Gurgaon Expressway Faridabad-121001 India
| | - Dinesh Mahajan
- Medicinal Chemistry and Pharmacology Lab, Translational Health Science and Technology Institute (THSTI), NCR Biotech Science Cluster 3rd Milestone Faridabad-Gurgaon Expressway Faridabad-121001 India
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16
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García‐Garrido SE, Presa Soto A, Hevia E, García‐Álvarez J. Advancing Air‐ and Moisture‐Compatible s‐Block Organometallic Chemistry Using Sustainable Solvents. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100347] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sergio E. García‐Garrido
- Laboratorio de Compuestos Organometálicos y Catálisis Departamento de Química Orgánica e Inorgánica (IUQOEM) Centro de Innovación en Química Avanzada (ORFEO-CINQA) Facultad de Química Universidad de Oviedo 33071 Oviedo Spain
| | - Alejandro Presa Soto
- Laboratorio de Compuestos Organometálicos y Catálisis Departamento de Química Orgánica e Inorgánica (IUQOEM) Centro de Innovación en Química Avanzada (ORFEO-CINQA) Facultad de Química Universidad de Oviedo 33071 Oviedo Spain
| | - Eva Hevia
- Departement für Chemie, Biochemie und Pharmazie (DCBP) Universität Bern Freiestrasse 3 3012 Bern Switzerland
| | - Joaquín García‐Álvarez
- Laboratorio de Compuestos Organometálicos y Catálisis Departamento de Química Orgánica e Inorgánica (IUQOEM) Centro de Innovación en Química Avanzada (ORFEO-CINQA) Facultad de Química Universidad de Oviedo 33071 Oviedo Spain
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17
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Sahoo RK, Sarkar N, Nembenna S. Zinc Hydride Catalyzed Chemoselective Hydroboration of Isocyanates: Amide Bond Formation and C=O Bond Cleavage. Angew Chem Int Ed Engl 2021; 60:11991-12000. [PMID: 33638314 DOI: 10.1002/anie.202100375] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 02/16/2021] [Indexed: 12/15/2022]
Abstract
Herein, a remarkable conjugated bis-guanidinate (CBG) supported zinc hydride, [{LZnH}2 ; L={(ArHN)(ArN)-C=N-C=(NAr)(NHAr); Ar=2,6-Et2 -C6 H3 }] (I) catalyzed partial reduction of heteroallenes via hydroboration is reported. A large number of aryl and alkyl isocyanates, including electron-donating and withdrawing groups, undergo reduction to obtain selectively N-boryl formamide, bis(boryl) hemiaminal and N-boryl methyl amine products. The compound I effectively catalyzes the chemoselective reduction of various isocyanates, in which the construction of the amide bond occurs. Isocyanates undergo a deoxygenation hydroboration reaction, in which the C=O bond cleaves, leading to N-boryl methyl amines. Several functionalities such as nitro, cyano, halide, and alkene groups are well-tolerated. Furthermore, a series of kinetic, control experiments and structurally characterized intermediates suggest that the zinc hydride species are responsible for all reduction steps and breaking the C=O bond.
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Affiliation(s)
- Rajata Kumar Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Nabin Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar, 752050, India
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18
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Elorriaga D, de la Cruz-Martínez F, Rodríguez-Álvarez MJ, Lara-Sánchez A, Castro-Osma JA, García-Álvarez J. Fast Addition of s-Block Organometallic Reagents to CO 2 -Derived Cyclic Carbonates at Room Temperature, Under Air, and in 2-Methyltetrahydrofuran. CHEMSUSCHEM 2021; 14:2084-2092. [PMID: 33666346 DOI: 10.1002/cssc.202100262] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/04/2021] [Indexed: 06/12/2023]
Abstract
Fast addition of highly polar organometallic reagents (RMgX/RLi) to cyclic carbonates (derived from CO2 as a sustainable C1 synthon) has been studied in 2-methyltetrahydrofuran as a green reaction medium or in the absence of external volatile organic solvents, at room temperature, and in the presence of air/moisture. These reaction conditions are generally forbidden with these highly reactive main-group organometallic compounds. The correct stoichiometry and nature of the polar organometallic alkylating or arylating reagent allows straightforward synthesis of: highly substituted tertiary alcohols, β-hydroxy esters, or symmetric ketones, working always under air and at room temperature. Finally, an unprecedented one-pot/two-step hybrid protocol is developed through combination of an Al-catalyzed cycloaddition of CO2 and propylene oxide with the concomitant fast addition of RLi reagents to the in situ and transiently formed cyclic carbonate, thus allowing indirect conversion of CO2 into the desired highly substituted tertiary alcohols without need for isolation or purification of any reaction intermediates.
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Affiliation(s)
- David Elorriaga
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071, Ciudad Real, Spain
| | - Felipe de la Cruz-Martínez
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071, Ciudad Real, Spain
| | - María Jesús Rodríguez-Álvarez
- Laboratorio de Compuestos Organometálicos y Catálisis (Unidad Asociada al CSIC), Departamento de Química Orgánica e Inorgánica, (IUQOEM), Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Química, Universidad de Oviedo, 33071, Oviedo, Spain
| | - Agustín Lara-Sánchez
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071, Ciudad Real, Spain
| | - José Antonio Castro-Osma
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Farmacia, Universidad de Castilla-La Mancha, 02071, Albacete, Spain
| | - Joaquín García-Álvarez
- Laboratorio de Compuestos Organometálicos y Catálisis (Unidad Asociada al CSIC), Departamento de Química Orgánica e Inorgánica, (IUQOEM), Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Química, Universidad de Oviedo, 33071, Oviedo, Spain
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19
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Zinc Hydride Catalyzed Chemoselective Hydroboration of Isocyanates: Amide Bond Formation and C=O Bond Cleavage. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100375] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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20
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Lin Y, He SF, Geng H, Xiao YC, Ji KL, Zheng JF, Huang PQ. Chemoselective Reactions of Isocyanates with Secondary Amides: One-Pot Construction of 2,3-Dialkyl-Substituted Quinazolinones. J Org Chem 2021; 86:5345-5353. [PMID: 33710879 DOI: 10.1021/acs.joc.0c02929] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A facile method for the preparation of 2,3-dialkyl-substituted quinazolinones from readily available N-arylamides and commercial isocyanates was developed. This one-pot procedure involves the chemoselective activation of the secondary amide with Tf2O/2-Br-Pyr, the sequential addition of isocyanate, and cyclization. The mild reaction is general for a wide range of substrates and can be run on a gram scale.
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Affiliation(s)
- Yi Lin
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Shu-Fan He
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Hui Geng
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Yu-Chen Xiao
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Kan-Lei Ji
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Jian-Feng Zheng
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China.,State Key Laboratory of Bio-organic and Natural Products Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, P. R. China
| | - Pei-Qiang Huang
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
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21
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Synthesis of stable α-fluoromethyl putative carbanions via a chemoselective reduction-monofluoromethylation sequence of diselenides under sustainable conditions. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.131921] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Ielo L, Miele M, Pillari V, Senatore R, Mirabile S, Gitto R, Holzer W, Alcántara AR, Pace V. Taking advantage of lithium monohalocarbenoid intrinsic α-elimination in 2-MeTHF: controlled epoxide ring-opening en route to halohydrins. Org Biomol Chem 2021; 19:2038-2043. [PMID: 33599644 DOI: 10.1039/d0ob02407d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The intrinsic degradative α-elimination of Li carbenoids somehow complicates their use in synthesis as C1-synthons. Nevertheless, we herein report how boosting such an α-elimination is a straightforward strategy for accomplishing controlled ring-opening of epoxides to furnish the corresponding β-halohydrins. Crucial for the development of the method is the use of the eco-friendly solvent 2-MeTHF, which forces the degradation of the incipient monohalolithium, due to the very limited stabilizing effect of this solvent on the chemical integrity of the carbenoid. With this approach, high yields of the targeted compounds are consistently obtained under very high regiocontrol and, despite the basic nature of the reagents, no racemization of enantiopure materials is observed.
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Affiliation(s)
- Laura Ielo
- University of Vienna - Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria. and University of Turin - Department of Chemistry, Via P. Giuria 7, 10125, Turin, Italy
| | - Margherita Miele
- University of Vienna - Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria.
| | - Veronica Pillari
- University of Vienna - Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria.
| | - Raffaele Senatore
- University of Vienna - Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria.
| | - Salvatore Mirabile
- University of Messina - Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, Viale Palatucci, 13, 98168 Messina, Italy
| | - Rosaria Gitto
- University of Messina - Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, Viale Palatucci, 13, 98168 Messina, Italy
| | - Wolfgang Holzer
- University of Vienna - Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria.
| | - Andrés R Alcántara
- Complutense University of Madrid - Department of Chemistry in Pharmaceutical Sciences, Plaza de Ramón y Cajal, s/n, Madrid, Spain.
| | - Vittorio Pace
- University of Vienna - Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria. and University of Turin - Department of Chemistry, Via P. Giuria 7, 10125, Turin, Italy
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23
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Więcław MM, Furman B. Direct synthesis of anomeric tetrazolyl iminosugars from sugar-derived lactams. Beilstein J Org Chem 2021; 17:115-123. [PMID: 33519998 PMCID: PMC7814180 DOI: 10.3762/bjoc.17.12] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 12/16/2020] [Indexed: 11/23/2022] Open
Abstract
Herein we present the direct asymmetric synthesis of tetrazole-functionalized 1-deoxynojirimycin derivatives from simple sugars via a Schwartz’s reagent-mediated reductive amide functionalization followed by a variant of the Ugi–azide multicomponent reaction. The anomeric configurations of two products were unambiguously confirmed by X-ray analysis. This work also describes examples of interesting further transformations of the title products. Finally, some surprising observations regarding the mechanism of their formation were made.
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Affiliation(s)
- Michał Mateusz Więcław
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Bartłomiej Furman
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
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24
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Ghorbani-Choghamarani A, Taherinia Z. Fe 3O 4@GlcA@Cu-MOF: A Magnetic Metal-Organic Framework as a Recoverable Catalyst for the Hydration of Nitriles and Reduction of Isothiocyanates, Isocyanates, and Isocyanides. ACS COMBINATORIAL SCIENCE 2020; 22:902-909. [PMID: 33186013 DOI: 10.1021/acscombsci.0c00178] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A novel magnetic metal-organic framework (Fe3O4@GlcA@Cu-MOF) has been prepared and characterized by spectroscopic, microscopic, and magnetic techniques. This magnetically separable catalyst exhibited high catalytic activity for nitrile hydration and the ability to reduce isothiocyanates, isocyanates, and isocyanides with excellent activity and selectivity without any additional reducing agent.
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Affiliation(s)
| | - Zahra Taherinia
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan 6517838683, Iran
- Department of Chemistry, Ilam University, and P.O. Box 69315516, Ilam, Iran
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25
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Cheng H, Chen C, Zhang R, Zhang JC, Zhang WY, He YQ, Gu YC. A Practical Approach for the Transamidation of N,N-Dimethyl Amides with Primary Amines Promoted by Sodium tert-Butoxide under Solvent-Free Conditions. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1705892] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractA practical sodium tert-butoxide (NaOtBu)-mediated protocol is disclosed for the transamidation of various N,N-dimethyl amides with primary amines to afford the corresponding amides in moderate to good yields at room temperature under solvent-free conditions. This protocol features a facile work-up procedure and good functional group compatibility, especially for N,N-dimethyl amides with long-chain alkyl groups and heteroatom-containing amines. Notably, a few representative gram-scale reactions proceed smoothly to furnish the desired amides in high yields, which demonstrates the potential of this process for further practical applications. Several control experiments are carried out and a plausible mechanism is provided.
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Affiliation(s)
- Hua Cheng
- Department of Chemical Engineering and Food Science
| | - Cheng Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
| | - Rui Zhang
- Department of Chemical Engineering and Food Science
| | | | - Wei-Yi Zhang
- Department of Chemical Engineering and Food Science
| | - Yu-Qing He
- Department of Chemical Engineering and Food Science
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26
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Fairley M, Bole LJ, Mulks FF, Main L, Kennedy AR, O'Hara CT, García-Alvarez J, Hevia E. Ultrafast amidation of esters using lithium amides under aerobic ambient temperature conditions in sustainable solvents. Chem Sci 2020; 11:6500-6509. [PMID: 32874519 PMCID: PMC7441706 DOI: 10.1039/d0sc01349h] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 04/29/2020] [Indexed: 12/16/2022] Open
Abstract
Using 2-methyl THF as solvent enables efficient and ultrafast amidation of esters by lithium amides at room temperature in air, edging closer towards reaching air- and moisture-compatible polar organometallic chemistry.
Lithium amides constitute one of the most commonly used classes of reagents in synthetic chemistry. However, despite having many applications, their use is handicapped by the requirement of low temperatures, in order to control their reactivity, as well as the need for dry organic solvents and protective inert atmosphere protocols to prevent their fast decomposition. Advancing the development of air- and moisture-compatible polar organometallic chemistry, the chemoselective and ultrafast amidation of esters mediated by lithium amides is reported. Establishing a novel sustainable access to carboxamides, this has been accomplished via direct C–O bond cleavage of a range of esters using glycerol or 2-MeTHF as a solvent, in air. High yields and good selectivity are observed while operating at ambient temperature, without the need for transition-metal mediation, and the protocol extends to transamidation processes. Pre-coordination of the organic substrate to the reactive lithium amide as a key step in the amidation processes has been assessed, enabling the structural elucidation of the coordination adduct [{Li(NPh2)(O
Created by potrace 1.16, written by Peter Selinger 2001-2019
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CPh(NMe2))}2] (8) when toluene is employed as a solvent. No evidence for formation of a complex of this type has been found when using donor THF as a solvent. Structural and spectroscopic insights into the constitution of selected lithium amides in 2-MeTHF are provided that support the involvement of small kinetically activated aggregates that can react rapidly with the organic substrates, favouring the C–O bond cleavage/C–N bond formation processes over competing hydrolysis/degradation of the lithium amides by moisture or air.
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Affiliation(s)
- Michael Fairley
- Department of Pure and Applied Chemistry , University of Strathclyde Glasgow , G1 1XL , UK
| | - Leonie J Bole
- Department für Chemie und Biochemie , Universität Bern , CH3012 , Bern , Switzerland .
| | - Florian F Mulks
- Department of Pure and Applied Chemistry , University of Strathclyde Glasgow , G1 1XL , UK.,Department für Chemie und Biochemie , Universität Bern , CH3012 , Bern , Switzerland .
| | - Laura Main
- Department of Pure and Applied Chemistry , University of Strathclyde Glasgow , G1 1XL , UK
| | - Alan R Kennedy
- Department of Pure and Applied Chemistry , University of Strathclyde Glasgow , G1 1XL , UK
| | - Charles T O'Hara
- Department of Pure and Applied Chemistry , University of Strathclyde Glasgow , G1 1XL , UK
| | - Joaquín García-Alvarez
- Laboratorio de Compuestos Organometálicos y Catálisis (Unidad Asociada al CSIC) , Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Departamento de Química Orgánica e Inorgánica (IUQOEM) , Facultad de Química , Universidad de Oviedo , E-33071 , Oviedo , Spain
| | - Eva Hevia
- Department of Pure and Applied Chemistry , University of Strathclyde Glasgow , G1 1XL , UK.,Department für Chemie und Biochemie , Universität Bern , CH3012 , Bern , Switzerland .
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27
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Narczyk A, Stecko S. The synthesis of unnatural α-alkyl- and α-aryl-substituted serine derivatives. Org Biomol Chem 2020; 18:1204-1213. [PMID: 31995087 DOI: 10.1039/c9ob02472g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of α-aryl- and α-alkyl-substituted serine derivatives via [3,3]-sigmatropic rearrangement of allyl carbamates as a key step is reported. Allyl carbamates were obtained from the corresponding allyl alcohols. The former were prepared through three approaches. Aryl-substituted ones were synthesized via the Stille coupling reaction of aryl iodides with enantiomerically enriched vinyl stannanes. Conversely, alkyl-substituted allyl alcohols were prepared by an analogous strategy involving the Negishi coupling reaction of enantiomerically enriched vinyl iodides or by enzymatic kineric resolution of the corresponding racemic alcohols.
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Affiliation(s)
- Aleksandra Narczyk
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Sebastian Stecko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
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28
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Vargová D, Mudráková B, Némethová I, Šebesta R. Reductions of Imines Using Zirconocene Chloride Hydride. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901607] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Denisa Vargová
- Faculty of Natural Sciences; Department of Organic Chemistry; Comenius University in Bratislava; Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Brigita Mudráková
- Faculty of Natural Sciences; Department of Organic Chemistry; Comenius University in Bratislava; Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Ivana Némethová
- Faculty of Natural Sciences; Department of Organic Chemistry; Comenius University in Bratislava; Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Radovan Šebesta
- Faculty of Natural Sciences; Department of Organic Chemistry; Comenius University in Bratislava; Mlynská dolina, Ilkovičova 6 84215 Bratislava Slovakia
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29
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Liu YP, Zhu CJ, Yu CC, Wang AE, Huang PQ. Tf2
O-Mediated Intermolecular Coupling of Secondary Amides with Enamines or Ketones: A Versatile and Direct Access to β-Enaminones. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901354] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yong-Peng Liu
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology; College of Chemistry and Chemical Engineering; Xiamen University; 361005 Xiamen Fujian China
| | - Cheng-Jie Zhu
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology; College of Chemistry and Chemical Engineering; Xiamen University; 361005 Xiamen Fujian China
| | - Cun-Cun Yu
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology; College of Chemistry and Chemical Engineering; Xiamen University; 361005 Xiamen Fujian China
| | - Ai-E Wang
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology; College of Chemistry and Chemical Engineering; Xiamen University; 361005 Xiamen Fujian China
- College of Chemistry and Chemical Engineering; State Key Laboratory of Applied Organic Chemistry Lanzhou University; 730000 Lanzhou China
| | - Pei-Qiang Huang
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology; College of Chemistry and Chemical Engineering; Xiamen University; 361005 Xiamen Fujian China
- College of Chemistry and Chemical Engineering; State Key Laboratory of Applied Organic Chemistry Lanzhou University; 730000 Lanzhou China
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30
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Miele M, D'Orsi R, Sridharan V, Holzer W, Pace V. Highly chemoselective difluoromethylative homologation of iso(thio)cyanates: expeditious access to unprecedented α,α-difluoro(thio)amides. Chem Commun (Camb) 2019; 55:12960-12963. [PMID: 31602439 DOI: 10.1039/c9cc06929a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The new motif - α,α-difluoromethyl thioamide - has been assembled starting from isothiocyanate (as thioamide precursor) and a formal difluoromethyl-carbanion generated from commercially available TMSCHF2. Upon proper activation of this reagent with potassium tert-amylate, the high-yielding transfer of the difluorinated nucleophile takes place under high chemocontrol. Various sensitive functionalities (e.g. ester, nitrile, nitro, azido groups) can be accommodated across the isothiocyanate core, thus allowing a wide scope. The methodology is highly flexible and adaptable to prepare analogous α,α-difluoromethyl oxoamides by conveniently using isocyanates as the electrophilic building-blocks.
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Affiliation(s)
- Margherita Miele
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria.
| | - Rosarita D'Orsi
- Department of Sciences, University of Basilicata, Via dell'Ateneo Lucano 10, 85100 Potenza, Italy
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), 181143, India
| | - Wolfgang Holzer
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria.
| | - Vittorio Pace
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria.
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31
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Amides as surrogates of aldehydes for C-C bond formation: amide-based direct Knoevenagel-type condensation reaction and related reactions. Sci China Chem 2019. [DOI: 10.1007/s11426-019-9586-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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32
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Liu YP, Wang SR, Chen TT, Yu CC, Wang AE, Huang PQ. Enamines as Surrogates of Alkyl Carbanions for the Direct Conversion of Secondary Amides to α-Branched Ketones. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yong-Peng Liu
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005, Fujian People's Republic of China
| | - Shu-Ren Wang
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005, Fujian People's Republic of China
| | - Ting-Ting Chen
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005, Fujian People's Republic of China
| | - Cun-Cun Yu
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005, Fujian People's Republic of China
| | - Ai-E Wang
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005, Fujian People's Republic of China
- State Key Laboratory of Applied Organic Chemistry Lanzhou University; Lanzhou 730000 People's Republic of China
| | - Pei-Qiang Huang
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005, Fujian People's Republic of China
- State Key Laboratory of Applied Organic Chemistry Lanzhou University; Lanzhou 730000 People's Republic of China
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33
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de la Vega-Hernández K, Senatore R, Miele M, Urban E, Holzer W, Pace V. Chemoselective reduction of isothiocyanates to thioformamides mediated by the Schwartz reagent. Org Biomol Chem 2019; 17:1970-1978. [DOI: 10.1039/c8ob02312c] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Thioformamides are easily prepared – under full chemocontrol – through the partial reduction of isothiocyanates with the in situ generated Schwartz reagent.
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Affiliation(s)
| | - Raffaele Senatore
- University of Vienna
- Department of Pharmaceutical Chemistry
- 1090 Vienna
- Austria
| | - Margherita Miele
- University of Vienna
- Department of Pharmaceutical Chemistry
- 1090 Vienna
- Austria
| | - Ernst Urban
- University of Vienna
- Department of Pharmaceutical Chemistry
- 1090 Vienna
- Austria
| | - Wolfgang Holzer
- University of Vienna
- Department of Pharmaceutical Chemistry
- 1090 Vienna
- Austria
| | - Vittorio Pace
- University of Vienna
- Department of Pharmaceutical Chemistry
- 1090 Vienna
- Austria
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34
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Mutra MR, Dhandabani GK, Wang JJ. Mild Access to N-Formylation of Primary Amines using Ethers as C1 Synthons under Metal-Free Conditions. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800783] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mohana Reddy Mutra
- Department of Medicinal and Applied Chemistry; Kaohsiung Medical University; No. 100, Shih-Chuan 1st Rd, Sanmin District Kaohsiung City 807 Taiwan
| | - Ganesh Kumar Dhandabani
- Department of Medicinal and Applied Chemistry; Kaohsiung Medical University; No. 100, Shih-Chuan 1st Rd, Sanmin District Kaohsiung City 807 Taiwan
| | - Jeh-Jeng Wang
- Department of Medicinal and Applied Chemistry; Kaohsiung Medical University; No. 100, Shih-Chuan 1st Rd, Sanmin District Kaohsiung City 807 Taiwan
- Department of Medical Research; Kaohsiung Medical University Hospital; No. 100, Tzyou 1st Rd, Sanmin District Kaohsiung City 807 Taiwan
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35
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Castoldi L, Monticelli S, Senatore R, Ielo L, Pace V. Homologation chemistry with nucleophilic α-substituted organometallic reagents: chemocontrol, new concepts and (solved) challenges. Chem Commun (Camb) 2018; 54:6692-6704. [PMID: 29850663 DOI: 10.1039/c8cc02499e] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The transfer of a reactive nucleophilic CH2X unit into a preformed bond enables the introduction of a fragment featuring the exact and desired degree of functionalization through a single synthetic operation. The instability of metallated α-organometallic species often poses serious questions regarding the practicability of using this conceptually intuitive and simple approach for forming C-C or C-heteroatom bonds. A deep understanding of processes regulating the formation of these nucleophiles is a precious source of inspiration not only for successfully applying theoretically feasible transformations (i.e. determining how to employ a given reagent), but also for designing new reactions which ultimately lead to the introduction of molecular complexity via short experimental sequences.
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Affiliation(s)
- Laura Castoldi
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Serena Monticelli
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Raffaele Senatore
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Laura Ielo
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Vittorio Pace
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
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36
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Monticelli S, Rui M, Castoldi L, Missere G, Pace V. A practical guide for using lithium halocarbenoids in homologation reactions. MONATSHEFTE FUR CHEMIE 2018; 149:1285-1291. [PMID: 29983454 PMCID: PMC6006224 DOI: 10.1007/s00706-018-2232-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Accepted: 05/13/2018] [Indexed: 12/24/2022]
Abstract
ABSTRACT Lithium halocarbenoids are versatile reagents for accomplishing homologation processes. The fast α-elimination they suffer has been considered an important limitation for their extensive use. Herein, we present a series of practical considerations for an effective employment in the homologation of selected carbon electrophiles. GRAPHICAL ABSTRACT
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Affiliation(s)
- Serena Monticelli
- Department of Pharmaceutical Chemistry, University of Vienna, Vienna, Austria
| | - Marta Rui
- Department of Pharmaceutical Chemistry, University of Vienna, Vienna, Austria
| | - Laura Castoldi
- Department of Pharmaceutical Chemistry, University of Vienna, Vienna, Austria
| | - Giada Missere
- Department of Pharmaceutical Chemistry, University of Vienna, Vienna, Austria
| | - Vittorio Pace
- Department of Pharmaceutical Chemistry, University of Vienna, Vienna, Austria
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37
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Merging lithium carbenoid homologation and enzymatic reduction: A combinative approach to the HIV-protease inhibitor Nelfinavir. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.03.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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38
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Senatore R, Ielo L, Urban E, Holzer W, Pace V. Substituted α-Sulfur Methyl Carbanions: Effective Homologating Agents for the Chemoselective Preparation of β-Oxo Thioethers from Weinreb Amides. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800095] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Raffaele Senatore
- Department of Pharmaceutical Chemistry; University of Vienna; Althanstrasse 14 - 1090 Vienna Austria
| | - Laura Ielo
- Department of Pharmaceutical Chemistry; University of Vienna; Althanstrasse 14 - 1090 Vienna Austria
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences; University of Messina; Viale Annunziata 98168 Messina Italy
| | - Ernst Urban
- Department of Pharmaceutical Chemistry; University of Vienna; Althanstrasse 14 - 1090 Vienna Austria
| | - Wolfgang Holzer
- Department of Pharmaceutical Chemistry; University of Vienna; Althanstrasse 14 - 1090 Vienna Austria
| | - Vittorio Pace
- Department of Pharmaceutical Chemistry; University of Vienna; Althanstrasse 14 - 1090 Vienna Austria
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39
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Ziegler JA, Prange C, Lohrey TD, Bergman RG, Arnold J. Hydroboration Reactivity of Niobium Bis(N-heterocyclic carbene)borate Complexes. Inorg Chem 2018; 57:5213-5224. [DOI: 10.1021/acs.inorgchem.8b00247] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Jessica A. Ziegler
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Céline Prange
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Department of Chemistry and Applied Biosciences, Eidgenössische Technische Hochschule Zürich, Zürich CH-8093, Switzerland
| | - Trevor D. Lohrey
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Robert G. Bergman
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - John Arnold
- Department of Chemistry, University of California, Berkeley, California 94720, United States
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40
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Trupp L, Laurella SL, Tettamanzi MC, Barja BC, Bruttomesso AC. Long-range anisotropic effects in a V–shaped Tröger's base diformanilide: Conformational study by NMR assignment and DFT calculations. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.11.092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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41
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Wang AE, Yu CC, Chen TT, Liu YP, Huang PQ. Enamines as Surrogates of Alkene Carbanions for the Reductive Alkenylation of Secondary Amides: An Approach to Allylamines. Org Lett 2018; 20:999-1002. [PMID: 29384685 DOI: 10.1021/acs.orglett.7b03943] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A new strategy to construct allylamines through reductive alkenylation of secondary amides with enamines is reported. The method features the use of trifluoromethanesulfonic anhydride as an activation reagent of amides, and enamines as unconventional alkenylation reagents. In this manner, enamines serve as surrogates of alkene carbanions instead of the classical enolates equivalents. A possible mechanism involving a Hoffmann-like elimination of the amine-borane complex intermediate is proposed.
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Affiliation(s)
- Ai-E Wang
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, and iChem (Collaborative Innovation Centre of Chemistry for Energy Materials), College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China.,State Key Laboratory of Applied Organic Chemistry Lanzhou University , Lanzhou 730000, P. R. China
| | - Cun-Cun Yu
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, and iChem (Collaborative Innovation Centre of Chemistry for Energy Materials), College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China
| | - Ting-Ting Chen
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, and iChem (Collaborative Innovation Centre of Chemistry for Energy Materials), College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China
| | - Yong-Peng Liu
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, and iChem (Collaborative Innovation Centre of Chemistry for Energy Materials), College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China
| | - Pei-Qiang Huang
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, and iChem (Collaborative Innovation Centre of Chemistry for Energy Materials), College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China
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42
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Więcław MM, Stecko S. Hydrozirconation of C=X Functionalities with Schwartz's Reagent. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701537] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Michał M. Więcław
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Sebastian Stecko
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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43
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Wang Y, Zhan Z, Zhou Y, Lei M, Hu L. A green, efficient, and rapid procedure for the hydrogenation of nitroarenes to formanilides in water. MONATSHEFTE FUR CHEMIE 2018. [DOI: 10.1007/s00706-017-2071-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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44
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Pace V, Monticelli S, de la Vega-Hernández K, Castoldi L. Isocyanates and isothiocyanates as versatile platforms for accessing (thio)amide-type compounds. Org Biomol Chem 2018; 14:7848-54. [PMID: 27461156 DOI: 10.1039/c6ob00766j] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The addition of carbon (Grignard and organolithium reagents) and hydride nucleophiles (Schwartz reagent) to isocyanates and isothiocyanates constitutes a versatile, direct and high yielding approach to the synthesis of functionalized (thio)amide derivatives including haloamides and formamides. The chemoselective delivery of a nucleophilic (eventually configurationally stable) organometallic species to a given iso(thio)cyanate is the crucial parameter for the success of the strategy. Thus, the influence of the factors governing classical methodologies (e.g. dehydrative condensation) such as steric hindrance and electronic properties of the reactants become practically negligible.
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Affiliation(s)
- Vittorio Pace
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Serena Monticelli
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Karen de la Vega-Hernández
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Laura Castoldi
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
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45
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Chen H, Ye JL, Huang PQ. Chemoselective direct reductive trifluoromethylation of amides: a flexible access to functionalized α-trifluoromethylamines. Org Chem Front 2018. [DOI: 10.1039/c7qo01031a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A one-pot method is reported for the direct transformation of secondary amides to α-trifluoromethylamines.
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Affiliation(s)
- Hang Chen
- Department of Chemistry
- Fujian Provincial Key Laboratory of Chemical Biology
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Jian-Liang Ye
- Department of Chemistry
- Fujian Provincial Key Laboratory of Chemical Biology
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Pei-Qiang Huang
- Department of Chemistry
- Fujian Provincial Key Laboratory of Chemical Biology
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- College of Chemistry and Chemical Engineering
- Xiamen University
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46
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Ye JL, Zhu YN, Geng H, Huang PQ. Metal-free synthesis of quinolines by direct condensation of amides with alkynes: revelation of N-aryl nitrilium intermediates by 2D NMR techniques. Sci China Chem 2017. [DOI: 10.1007/s11426-017-9160-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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47
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Huang PQ, Fan T. Intramolecular Keto Lactam Condensation: A Convenient and Straightforward Approach to Bicyclic Vinylogous Lactams. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701060] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Pei-Qiang Huang
- Department of Chemistry and The Key Laboratory for Chemical Biology of Fujian Province; iChEM (Collaborative Innovation Center of Chemistry for Energy Materials); College of Chemistry and Chemical Engineering; Xiamen University; 361005 Xiamen Fujian P. R. China
- State Key Laboratory of Elemento-Organic Chemistry; Nankai University; 300071 Tianjin P. R. China
| | - Ting Fan
- Department of Chemistry and The Key Laboratory for Chemical Biology of Fujian Province; iChEM (Collaborative Innovation Center of Chemistry for Energy Materials); College of Chemistry and Chemical Engineering; Xiamen University; 361005 Xiamen Fujian P. R. China
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48
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Zheng JF, Hu XN, Xu Z, Cai DC, Shen TL, Huang PQ. Substrate-Controlled Chemoselective Reactions of Isocyanoacetates with Amides and Lactams. J Org Chem 2017; 82:9693-9703. [DOI: 10.1021/acs.joc.7b01768] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jian-Feng Zheng
- Department of Chemistry,
Fujian Provincial Key Laboratory of Chemical Biology, iChEM (Collaborative
Innovation Center of Chemistry for Energy Materials), College of Chemistry
and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Xiu-Ning Hu
- Department of Chemistry,
Fujian Provincial Key Laboratory of Chemical Biology, iChEM (Collaborative
Innovation Center of Chemistry for Energy Materials), College of Chemistry
and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Zhen Xu
- Department of Chemistry,
Fujian Provincial Key Laboratory of Chemical Biology, iChEM (Collaborative
Innovation Center of Chemistry for Energy Materials), College of Chemistry
and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Dong-Cheng Cai
- Department of Chemistry,
Fujian Provincial Key Laboratory of Chemical Biology, iChEM (Collaborative
Innovation Center of Chemistry for Energy Materials), College of Chemistry
and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Tai-Long Shen
- Department of Chemistry,
Fujian Provincial Key Laboratory of Chemical Biology, iChEM (Collaborative
Innovation Center of Chemistry for Energy Materials), College of Chemistry
and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Pei-Qiang Huang
- Department of Chemistry,
Fujian Provincial Key Laboratory of Chemical Biology, iChEM (Collaborative
Innovation Center of Chemistry for Energy Materials), College of Chemistry
and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
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49
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Pinheiro DLJ, Ávila EP, Batista GMF, Amarante GW. Chemoselective Reduction of Azlactones Using Schwartz’s Reagent. J Org Chem 2017; 82:5981-5985. [DOI: 10.1021/acs.joc.7b00820] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Danielle L. J. Pinheiro
- Chemistry Department, Federal University of Juiz de Fora, Cidade Universitária, São Pedro, Juiz de Fora, MG CEP 36036-900, Brazil
| | - Eloah P. Ávila
- Chemistry Department, Federal University of Juiz de Fora, Cidade Universitária, São Pedro, Juiz de Fora, MG CEP 36036-900, Brazil
| | - Gabriel M. F. Batista
- Chemistry Department, Federal University of Juiz de Fora, Cidade Universitária, São Pedro, Juiz de Fora, MG CEP 36036-900, Brazil
| | - Giovanni W. Amarante
- Chemistry Department, Federal University of Juiz de Fora, Cidade Universitária, São Pedro, Juiz de Fora, MG CEP 36036-900, Brazil
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50
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Slagbrand T, Kervefors G, Tinnis F, Adolfsson H. An Efficient One-pot Procedure for the Direct Preparation of 4,5-Dihydroisoxazoles from Amides. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700154] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Tove Slagbrand
- Department of Organic Chemistry; Arrhenius Laboratory; Stockholm University; SE-106 91 Stockholm Sweden
| | - Gabriella Kervefors
- Department of Organic Chemistry; Arrhenius Laboratory; Stockholm University; SE-106 91 Stockholm Sweden
| | - Fredrik Tinnis
- Department of Organic Chemistry; Arrhenius Laboratory; Stockholm University; SE-106 91 Stockholm Sweden
| | - Hans Adolfsson
- Department of Organic Chemistry; Arrhenius Laboratory; Stockholm University; SE-106 91 Stockholm Sweden
- Department of Chemistry; Umeå University; SE-901 87 Umeå Sweden
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