1
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Turman NC, Smith KL, Crawford ET, Robins JG, Weber KM, Liu S, Johnson JS. Rhodium-Catalyzed Asymmetric Arylation-Induced Glycolate Aldol Additions of Silyl Glyoxylates. Angew Chem Int Ed Engl 2023; 62:e202311554. [PMID: 37642944 PMCID: PMC10593381 DOI: 10.1002/anie.202311554] [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: 08/08/2023] [Revised: 08/24/2023] [Accepted: 08/28/2023] [Indexed: 08/31/2023]
Abstract
(Diene)Rh(I) complexes catalyze the stereoselective three-component coupling of silyl glyoxylates, arylboronic acids, and aldehydes to give glycolate aldol products. The participation of Rh-alkoxides in the requisite Brook rearrangement was established through two component Rh-catalyzed couplings of silyl glyoxylates with ArB(OH)2 to give silyl-protected mandelate derivatives. The intermediacy of a chiral Rh-enolate was inferred through enantioselective protonation using a chiral Rh-catalyst. Diastereoselective three-component couplings with aldehydes as terminating electrophiles to give racemic products were best achieved with a bulky aryl ester on the silyl glyoxylate reagent. Optimal enantioselective couplings were carried out with the tert-butyl ester variant using an anisole-derived enantiopure tricyclo[3.2.2.02,4 ]nonadiene ligand.
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Affiliation(s)
- Nolan C. Turman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290 (USA)
| | - Kendrick L. Smith
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290 (USA)
| | - Evan T. Crawford
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290 (USA)
| | - Jacob G. Robins
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290 (USA)
| | - Kathryn M. Weber
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290 (USA)
| | - Shubin Liu
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290 (USA)
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290 (USA)
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2
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Matsumoto A, Maeda N, Maruoka K. Bidirectional Elongation Strategy Using Ambiphilic Radical Linchpin for Modular Access to 1,4-Dicarbonyls via Sequential Photocatalysis. J Am Chem Soc 2023; 145:20344-20354. [PMID: 37490759 DOI: 10.1021/jacs.3c05337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Organic molecules that can be connected to multiple substrates by sequential C-C bond formations can be utilized as linchpins in multicomponent processes. While they are useful for rapidly increasing molecular complexity, most of the reported linchpin coupling methods rely on the use of organometallic species as strong carbon nucleophiles to form C-C bonds, which narrows the functional group compatibility. Here, we describe a metal-free, radical-mediated coupling approach using a formyl-stabilized phosphonium ylide as a multifunctional linchpin under visible-light photoredox conditions. The present method uses the ambiphilic character of the phosphonium ylide, which serves as both a nucleophilic and an electrophilic carbon-centered radical source. The stepwise and controllable generation of these radical intermediates allows sequential photocatalysis involving two mechanistically distinct radical additions, both of which are initiated by the same photocatalyst in one pot with high functional group tolerance. The methodology enables a bidirectional assembly of the linchpin with two electronically differentiated alkene fragments and thus offers rapid and modular access to 1,4-dicarbonyl compounds as versatile synthetic intermediates.
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Affiliation(s)
- Akira Matsumoto
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Natsumi Maeda
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Keiji Maruoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
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3
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Liang XX, Zhu C, Zhang W, Du YN, Xu L, Liu L, Zhang Y, Han MY. Nucleophilic Allylation of Acylsilanes in Water: An Effective Alternative to Functionalized Tertiary α-Silylalcohols. J Org Chem 2023; 88:12087-12099. [PMID: 37497648 DOI: 10.1021/acs.joc.3c00668] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
A nucleophilic allylation of acylsilanes in water was developed, generating versatile functionalized tertiary α-silyl alcohols in high yields. With the assistance of hydrogen bonding, a reaction model of less reactive acylsilane was achieved. Unlike the conventional strategy, transition metals and an additional Lewis acid catalyst were not required, and rate acceleration was observed in water.
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Affiliation(s)
- Xiu-Xia Liang
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Chen Zhu
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Wang Zhang
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Ya-Nan Du
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Lei Xu
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Lihua Liu
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Yicheng Zhang
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Man-Yi Han
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
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4
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Sang X, Mo Y, Li S, Liu X, Cao W, Feng X. Bimetallic tandem catalysis-enabled enantioselective cycloisomerization/carbonyl-ene reaction for construction of 5-oxazoylmethyl α-silyl alcohol. Chem Sci 2023; 14:8315-8320. [PMID: 37564412 PMCID: PMC10411629 DOI: 10.1039/d3sc01048a] [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: 02/24/2023] [Accepted: 07/06/2023] [Indexed: 08/12/2023] Open
Abstract
A bimetallic tandem catalysis-enabled enantioselective cycloisomerization/carbonyl-ene reaction was developed. The reaction proceeded well with a broad range of N-propargylamides and acylsilanes, affording the target chiral 5-oxazoylmethyl α-silyl alcohols in up to 95% yield and 99% ee under mild conditions. Importantly, this facile protocol was available for the late-stage modification of several bioactive molecules. Based on the mechanistic study and control experiments, a possible catalytic cycle and transition state are proposed to elucidate the reaction process and enantioinduction.
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Affiliation(s)
- Xinpeng Sang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China
| | - Yuhao Mo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China
| | - Shiya Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China
| | - Weidi Cao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China
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5
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Li Q, Liang XX, Zhang W, Han MY. Friedel-Crafts Reaction of Acylsilanes: Highly Chemoselective Synthesis of 1-Hydroxy-bis(indolyl)methanes and 1-Silyl-bis(indolyl)methanes Derivatives. Molecules 2023; 28:5685. [PMID: 37570655 PMCID: PMC10420641 DOI: 10.3390/molecules28155685] [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: 05/18/2023] [Revised: 07/21/2023] [Accepted: 07/24/2023] [Indexed: 08/13/2023] Open
Abstract
A novel double Friedel-Crafts reaction of acylsilanes in water is described. This strategy enables synthesis of bis(indolyl)methane derivatives with 1-hydroxy or 1-silyl substituents in moderate to high yield. Compared to the 1-silyl-bis(indolyl)methane derivatives from indole substrate, 1-hydroxy-bis(indolyl)methane derivatives were synthesized from the 5-hydroxyindole, and the hydrogen bonds in the 5-hydroxyindole play a crucial role in regulating the reaction selectivity.
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Affiliation(s)
| | | | | | - Man-Yi Han
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, College of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, China; (Q.L.); (X.-X.L.); (W.Z.)
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6
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Chandrasekaran R, Pulikkottil FT, Elama KS, Rasappan R. Direct synthesis and applications of solid silylzinc reagents. Chem Sci 2021; 12:15719-15726. [PMID: 35003603 PMCID: PMC8654096 DOI: 10.1039/d1sc06038d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 11/19/2021] [Indexed: 01/29/2023] Open
Abstract
The increased synthetic utility of organosilanes has motivated researchers to develop milder and more practical synthetic methods. Silylzinc reagents, which are typically the most functional group tolerant, are notoriously difficult to synthesize because they are obtained by a pyrophoric reaction of silyllithium, particularly Me3SiLi which is itself prepared by the reaction of MeLi and disilane. Furthermore, the dissolved LiCl in silylzinc may have a detrimental effect. A synthetic method that can avoid silyllithium and involves a direct synthesis of silylzinc reagents from silyl halides is arguably the simplest and most economical strategy. We describe, for the first time, the direct synthesis of PhMe2SiZnI and Me3SiZnI reagents by employing a coordinating TMEDA ligand, as well as single crystal XRD structures. Importantly, they can be obtained as solids and stored for longer periods at 4 °C. We also demonstrate their significance in cross-coupling of various free alkyl/aryl/alkenyl carboxylic acids with broader functional group tolerance and API derivatives. The general applicability and efficiency of solid Me3SiZnI are shown in a wide variety of reactions including alkylation, arylation, allylation, 1,4-addition, acylation and more.
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Affiliation(s)
- Revathi Chandrasekaran
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India
| | - Feba Thomas Pulikkottil
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India
| | - Krishna Suresh Elama
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India
| | - Ramesh Rasappan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India
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7
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Zhang X, Gao Y, Liu Y, Miao Z. Diastereoselective Synthesis of Tetrabenzohydrofuran Spirooxindoles via Diethyl Phosphite-Mediated Coupling of Isatins with o-Quinone Methides. J Org Chem 2021; 86:8630-8640. [PMID: 34162210 DOI: 10.1021/acs.joc.1c00336] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diethyl phosphite-initiated coupling of isatins with o-quinone methides (o-QMs) is reported. This reaction involves a cascade transformation initiated by base-promoted addition of phosphite to isatins, followed by [1,2]-phospha-Brook rearrangement. This generates α-phosphonyloxy enolates that are subsequently intercepted by o-QMs and finally intramolecular ring closure. This protocol was used to diastereoselectively synthesize a range of trans-tetrabenzohydrofuran spirooxindoles in moderate to good yields with moderate to excellent diastereoselectivities.
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Affiliation(s)
- Xiyuan Zhang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Weijin Road 94, Tianjin 300071, China
| | - Yanfeng Gao
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Weijin Road 94, Tianjin 300071, China
| | - Yitong Liu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Weijin Road 94, Tianjin 300071, China
| | - Zhiwei Miao
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Weijin Road 94, Tianjin 300071, China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
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8
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Guan M, Wang S, Luo Y, Cao W, Liu X, Feng X. Catalytic asymmetric addition of thiols to silyl glyoxylates for synthesis of multi-hetero-atom substituted carbon stereocenters. Chem Sci 2021; 12:7498-7503. [PMID: 34163840 PMCID: PMC8171345 DOI: 10.1039/d1sc01096d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
A chiral Lewis acid-catalyzed enantioselective addition of thiols to silyl glyoxylates was developed. The reaction proceeds well with a broad range of thiols and acylsilanes, affording the target tertiary chiral α-silyl–α-sulfydryl alcohols with multi-hetero-atom carbon stereocenters in excellent yields (up to 99%) and enantioselectivities (up to 98% ee). A series of control experiments were conducted to elucidate the reaction mechanism. Enantioselective addition of thiols to silyl glyoxylates for construction of a multi-hetero-atom substituted carbon stereocenter was described.![]()
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Affiliation(s)
- Mingming Guan
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China http://www.scu.edu.cn/chem_asl/
| | - Shiyu Wang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China http://www.scu.edu.cn/chem_asl/
| | - Yao Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China http://www.scu.edu.cn/chem_asl/
| | - Weidi Cao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China http://www.scu.edu.cn/chem_asl/
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China http://www.scu.edu.cn/chem_asl/
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 P. R. China http://www.scu.edu.cn/chem_asl/
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9
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Zhu C, Han MY, Liang XX, Guan B, Li P, Wang L. Hydrogen-Bond-Assisted Sequential Reaction of Silyl Glyoxylates: Stereoselective Synthesis of Silyl Enol Ethers. Org Lett 2021; 23:54-59. [PMID: 33320686 DOI: 10.1021/acs.orglett.0c03683] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel hydrogen-bond-assisted sequential reaction of silyl glyoxylates is described. This method provides an efficient strategy for the synthesis of silyl enol ethers with high selectivity. In these transformations, hydrogen bonds from 2-nitroethanol and its derivatives are critical to the stereochemical outcome. Both E- and Z-isomers are achieved via Henry reaction/Brook rearrangement/elimination and Henry reaction/Brook rearrangement/retro-Henry reaction/elimination processes, respectively (up to 99:1 Z-selectivity, and 9.2:1 E-selectivity).
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Affiliation(s)
- Chen Zhu
- Department of Chemistry, Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Man-Yi Han
- Department of Chemistry, Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Xiu-Xia Liang
- Department of Chemistry, Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Bin Guan
- Department of Chemistry, Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Pinhua Li
- Department of Chemistry, Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032, P.R. China
| | - Lei Wang
- Department of Chemistry, Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032, P.R. China.,Advanced Research Institute and Department of Chemistry, Taizhou University, Taizhou, Zhejiang 318000, P.R. China
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10
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Onyeagusi CI, Malcolmson SJ. Strategies for the Catalytic Enantioselective Synthesis of α-Trifluoromethyl Amines. ACS Catal 2020; 10:12507-12536. [PMID: 34306806 PMCID: PMC8302206 DOI: 10.1021/acscatal.0c03569] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The exploitation of the α-trifluoromethylamino group as an amide surrogate in peptidomimetics and drug candidates has been on the rise. In a large number of these cases, this moiety bears stereochemistry with the stereochemical identity having important consequences on numerous molecular properties, such as the potency of the compound. Yet, the majority of stereoselective syntheses of α-CF3 amines rely on diastereoselective couplings with chiral reagents. Concurrent with the rapid expansion of fluorine into pharmaceuticals has been the development of catalytic enantioselective means of preparing α-trifluoromethyl amines. In this work, we outline the strategies that have been employed for accessing these enantioenriched amines, including normal polarity approaches and several recent developments in imine umpolung transformations.
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Affiliation(s)
- Chibueze I Onyeagusi
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Steven J Malcolmson
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
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11
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Han MY, Pan H, Li P, Wang L. Aqueous ZnCl 2 Complex Catalyzed Prins Reaction of Silyl Glyoxylates: Access to Functionalized Tertiary α-Silyl Alcohols. J Org Chem 2020; 85:5825-5837. [PMID: 32250619 DOI: 10.1021/acs.joc.9b03501] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
An efficient Prins reaction of silyl glyoxylates in the presence of an aqueous ZnCl2 complex as a catalyst was developed, providing functionalized tertiary α-silyl alcohols in high yields under mild conditions. A preliminary investigation indicated that the aqueous ZnCl2 complex acted as a dual functional catalyst of Brønsted and Lewis acid to activate the carbonyl groups of silyl glyoxylates via a dual-activation model.
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Affiliation(s)
- Man-Yi Han
- Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education; Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Hong Pan
- Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education; Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Pinhua Li
- Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education; Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Lei Wang
- Key Laboratory of Green and Precise Synthetic Chemistry, Ministry of Education; Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
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12
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Onyeagusi CI, Shao X, Malcolmson SJ. Enantio- and Diastereoselective Synthesis of Homoallylic α-Trifluoromethyl Amines by Catalytic Hydroalkylation of Dienes. Org Lett 2020; 22:1681-1685. [PMID: 32013445 PMCID: PMC7079280 DOI: 10.1021/acs.orglett.0c00342] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We describe a strategy for the enantio- and diastereoselective synthesis of homoallylic α-trifluoromethyl amines by the catalytic hydroalkylation of terminal dienes. Trifluoromethyl-substituted isatin-derived azadienolate nucleophiles undergo γ-selective alkylation with a Pd-DTBM-SEGPHOS catalyst, which additionally promotes regioselective addition to the diene and delivers products in up to 86% yield, 10:1 dr, and 97.5:2.5 er.
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Affiliation(s)
- Chibueze I Onyeagusi
- Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States
| | - Xinxin Shao
- Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States
| | - Steven J Malcolmson
- Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States
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13
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Pan H, Han MY, Li P, Wang L. “On Water” Direct Catalytic Vinylogous Aldol Reaction of Silyl Glyoxylates. J Org Chem 2019; 84:14281-14290. [DOI: 10.1021/acs.joc.9b01945] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hong Pan
- Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Man-Yi Han
- Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Pinhua Li
- Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Lei Wang
- Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P.R. China
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14
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Malcolmson SJ, Li K, Shao X. 2-Azadienes as Enamine Umpolung Synthons for the Preparation of Chiral Amines. Synlett 2019; 30:1253-1268. [PMID: 33731976 PMCID: PMC7963344 DOI: 10.1055/s-0037-1611770] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The development of new strategies for the preparation of chiral amines is an important objective in organic synthesis. In this Synpacts, we summarize our approach for catalytically accessing nucleophilic aminoalkyl metal species from 2-azadienes, and its application in generating a number of important but elusive chiral amine scaffolds. Reductive couplings with ketones and imines afford 1,2-amino tertiary alcohols and 1,2-diamines, respectively, whereas fluoroarylations of gem-difluoro-2-azadienes deliver α-trifluoromethylated benzylic amines.
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Affiliation(s)
| | - Kangnan Li
- Department of Chemistry, Duke University, NC 27708, USA
| | - Xinxin Shao
- Department of Chemistry, Duke University, NC 27708, USA
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15
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Feng J, Oestreich M. Tertiary α‐Silyl Alcohols by Diastereoselective Coupling of 1,3‐Dienes and Acylsilanes Initiated by Enantioselective Copper‐Catalyzed Borylation. Angew Chem Int Ed Engl 2019; 58:8211-8215. [DOI: 10.1002/anie.201903174] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Jian‐Jun Feng
- Institut für Chemie Technische Universität Berlin Strasse des 17. Juni 115 10623 Berlin Germany
| | - Martin Oestreich
- Institut für Chemie Technische Universität Berlin Strasse des 17. Juni 115 10623 Berlin Germany
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16
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Feng J, Oestreich M. Tertiäre α‐Silylalkohole mittels diastereoselektiver Kupplung von 1,3‐Dienen und Acylsilanen, eingeleitet durch enantioselektive kupferkatalysierte Borylierung. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201903174] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jian‐Jun Feng
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Martin Oestreich
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
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17
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Tang F, Ma PJ, Yao Y, Xu YJ, Lu CD. Divergent synthesis of polysubstituted cyclopropanes and β-silyoxy imidates via switchable additions of N-tert-butanesulfinylimidates to acylsilanes. Chem Commun (Camb) 2019; 55:3777-3780. [DOI: 10.1039/c9cc00963a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A switchable addition of N-tert-butanesulfinylimidates to acylsilanes leads to divergent synthesis of polysubstituted cyclopropanes and β-silyloxy imidates.
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Affiliation(s)
- Fan Tang
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Peng-Ju Ma
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Yun Yao
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
- China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
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18
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Marri G, Justaud F, Das S, Grée R. α-β Unsaturated Acylsilanes as Surrogates of Acrolein for Morita-Baylis-Hillman Reactions. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801343] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Gangababu Marri
- Department of Organic Synthesis and Process Chemistry; CSIR-Indian Institute of Chemical Technology; Uppal Road 500007 Hyderabad Telangana India
| | - Frédéric Justaud
- CNRS; ISCR (Institute for Chemical Sciences in Rennes); Univ Rennes; UMR 6226 35000 Rennes France
| | - Saibal Das
- Department of Organic Synthesis and Process Chemistry; CSIR-Indian Institute of Chemical Technology; Uppal Road 500007 Hyderabad Telangana India
| | - René Grée
- CNRS; ISCR (Institute for Chemical Sciences in Rennes); Univ Rennes; UMR 6226 35000 Rennes France
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19
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Han MY, Luan WY, Mai PL, Li P, Wang L. Organocatalytic Asymmetric Vinylogous Aldol Reaction of Allyl Aryl Ketones to Silyl Glyoxylates. J Org Chem 2018; 83:1518-1524. [DOI: 10.1021/acs.joc.7b02546] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Man-Yi Han
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Wen-Yu Luan
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Pei-Lin Mai
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Pinhua Li
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Lei Wang
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
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20
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Han MY, Pan H, Lin J, Li W, Li P, Wang L. A catalyst-controlled switchable reaction of β-keto acids to silyl glyoxylates. Org Biomol Chem 2018; 16:4117-4126. [DOI: 10.1039/c8ob00740c] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A catalyst-controlled switchable reaction of β-keto acids to silyl glyoxylates was developed and the decarboxylative-addition products were generated by using a thiourea catalyst.
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Affiliation(s)
- Man-Yi Han
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Hong Pan
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Jing Lin
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Wei Li
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Pinhua Li
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Lei Wang
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
- State Key Laboratory of Organometallic Chemistry
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21
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Huang W, Liu H, Xu YJ, Lu CD. Reaction of Silyllithium, α-Keto N-tert-Butanesulfinyl Imidates and Aldehydes for Asymmetric Synthesis of α-Substituted β-(Silyloxy)-α-hydroxy Acid Derivatives. J Org Chem 2017; 82:10748-10755. [PMID: 28910104 DOI: 10.1021/acs.joc.7b02214] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A single-flask reaction of silyllithium, α-keto N-tert-butanesulfinyl imidates and aldehydes has been developed for the diastereoselective synthesis of α,β-dihydroxy acid derivatives. In this reaction, the nucleophilic addition of silyllithium to chiral α-keto imidates followed by silyl migration forms chiral aza-enolates, which react diastereoselectively with aldehydes. Subsequent [1,4]-O → O silyl migration affords α-substituted β-(silyoxy)-α-hydroxy imidates.
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Affiliation(s)
- Wei Huang
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China.,University of the Chinese Academy of Sciences , Beijing 100049, China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
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22
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Bartlett SL, Johnson JS. Synthesis of Complex Glycolates by Enantioconvergent Addition Reactions. Acc Chem Res 2017; 50:2284-2296. [PMID: 28817258 DOI: 10.1021/acs.accounts.7b00263] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The unique role that stereochemistry plays in molecular recognition events continues to provide a driving force for synthesizing organic compounds in enantioenriched form. The tendency of enantioenriched organic compounds to revert to an entropically favored racemic state in the presence of viable racemization pathways (e.g., the enolization of stereogenic carbonyl derivatives) can sometimes interfere with this objective; however, beginning with Noyori's foundational disclosure of a dynamic kinetic transfer hydrogenation, the ability to channel racemic, configurationally labile starting materials through stereoconvergent reaction pathways has been recognized as a powerful strategy in asymmetric synthesis. Proton transfer, retro-aldol, retro-Michael, reversible redox events, and other processes that can be deleterious to asymmetric synthesis are exploitable in enantioconvergent reactions using chiral small molecules and enzymes as asymmetric catalysts. Enantioselective reduction of configurationally labile carbonyl derivatives bearing a C-H acidic chiral center are particularly common. Because facile racemization is vital to stereocontrol in these transformations, hydrogenations of β-dicarbonyls are commonplace, while less activated substrates have been used less commonly. Our entry into enantioconvergent catalysis evolved from a long-standing interest in the synthesis of complex glycolates and began with the development of a general Noyori-type transfer hydrogenation of α-keto esters. Key innovations in this work include the identification of a new terphenylsulfonamide-Ru(II) complex, which displays unusual preference toward reduction of α-keto esters, and the observation that α-keto esters racemize under mildly basic conditions. This work was extended to the dynamic kinetic hydrogenation of racemic acyl phosphonates. Moreover, the recent recognition that the mechanistic paradigm underlying enantioconvergent hydrogenation chemistry can be extended to diverse carbon-centered nucleophiles has led to advances in the art. Our lab has developed a number of enantioconvergent tertiary alcohol syntheses. In the context of carbon-centered nucleophiles, we have focused on the use of α-keto esters; however, in the latter part of this Account, we will briefly describe our nascent efforts to develop dynamic kinetic additions of carbon-centered nucleophiles to β-oxo acid derivatives. While the enantioconvergent hydrogenation of β-keto acid derivatives is carried out on 100-ton scale annually, non-hydrogenative transformations of these compounds constitute an underexplored subclass of enantioconvergent reactions. With regard to future prospects, a trend toward transformations that afford increasing levels of molecular complexity is apparent. It can be expected that the burgeoning field of asymmetric 1,2-addition chemistry will further drive this chemistry to encompass a wider array of enantioconvergent additions. Additionally, the continued exploration of these chemistries in the context of less conventional electrophiles, as well as identifying novel or overlooked modes of racemization, holds considerable potential.
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Affiliation(s)
- Samuel L. Bartlett
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290 United States
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290 United States
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23
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Lu Q, Yan C, Xiao XQ, Li Z, Wei N, Lai G, Kira M. Insertion of an Isolable Dialkylstannylene into C–Cl Bonds of Acyl Chlorides Giving Acyl(chloro)stannanes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00549] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qiong Lu
- Key Laboratory of Organosilicon
Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People’s Republic of China
| | - Chenting Yan
- Key Laboratory of Organosilicon
Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People’s Republic of China
| | - Xu-Qiong Xiao
- Key Laboratory of Organosilicon
Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People’s Republic of China
| | - Zhifang Li
- Key Laboratory of Organosilicon
Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People’s Republic of China
| | - Ningka Wei
- Key Laboratory of Organosilicon
Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People’s Republic of China
| | - Guoqiao Lai
- Key Laboratory of Organosilicon
Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People’s Republic of China
| | - Mitsuo Kira
- Key Laboratory of Organosilicon
Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People’s Republic of China
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24
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Zhang FG, Marek I. Brook Rearrangement as Trigger for Carbene Generation: Synthesis of Stereodefined and Fully Substituted Cyclobutenes. J Am Chem Soc 2017; 139:8364-8370. [DOI: 10.1021/jacs.7b04255] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Fa-Guang Zhang
- The Mallat Family Laboratory of Organic
Chemistry, Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Ilan Marek
- The Mallat Family Laboratory of Organic
Chemistry, Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
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25
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Han MY, Xie X, Zhou D, Li P, Wang L. Organocatalyzed Direct Aldol Reaction of Silyl Glyoxylates for the Synthesis of α-Hydroxysilanes. Org Lett 2017; 19:2282-2285. [DOI: 10.1021/acs.orglett.7b00811] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Man-Yi Han
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Xiaoyu Xie
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Di Zhou
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Pinhua Li
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
| | - Lei Wang
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032, P.R. China
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26
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Yin D, Liu H, Lu CD, Xu YJ. Dialkyl Phosphite-Initiated Cyclopropanation of α,β-Unsaturated Ketones Using α-Ketoesters or Isatin Derivatives. J Org Chem 2017; 82:3252-3261. [DOI: 10.1021/acs.joc.6b03009] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Deng Yin
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
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27
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Han MY, Yang FY, Zhou D, Xu Z. Organobase-catalyzed [1,2]-Brook rearrangement of silyl glyoxylates. Org Biomol Chem 2017; 15:1418-1425. [DOI: 10.1039/c7ob00005g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly efficient [1,2]-Brook rearrangement of silyl glyoxylates has been developed using DBU as the organo-base catalyst.
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Affiliation(s)
- Man-Yi Han
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Fei-Yan Yang
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Di Zhou
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Zhigang Xu
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies
- Faculty for Materials and Energy
- Southwest University
- Chongqing 400715
- P.R. China
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28
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Xiao XQ, Liu X, Lu Q, Li Z, Lai G, Kira M. Reactions of an Isolable Dialkylsilylene with Aroyl Chlorides. A New Route to Aroylsilanes. Molecules 2016; 21:molecules21101376. [PMID: 27754460 PMCID: PMC6273370 DOI: 10.3390/molecules21101376] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 10/03/2016] [Accepted: 10/08/2016] [Indexed: 11/29/2022] Open
Abstract
The reactions of isolable dialkylsilylene 1 with aromatic acyl chlorides afforded aroylsilanes 3a–3c exclusively. Aroylsilanes 3a–3c were characterized by 1H-, 13C-, and 29Si-NMR spectroscopy, high-resolution mass spectrometry (HRMS), and single-crystal molecular structure analysis. The reaction mechanisms are discussed in comparison with related reaction of 1 with chloroalkanes and chlorosilanes.
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Affiliation(s)
- Xu-Qiong Xiao
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China.
| | - Xupeng Liu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China.
| | - Qiong Lu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China.
| | - Zhifang Li
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China.
| | - Guoqiao Lai
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China.
| | - Mitsuo Kira
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China.
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29
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Boyce GR, Johnson JS. An Asymmetric Vinylogous Michael Cascade of Silyl Glyoximide, Vinyl Grignard, and Nitroalkenes via Long Range Stereoinduction. J Org Chem 2016; 81:1712-7. [PMID: 26833255 PMCID: PMC4761320 DOI: 10.1021/acs.joc.5b02693] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A diastereoselective auxiliary-mediated vinylation/[1,2]-Brook rearrangement/vinylogous Michael cascade of silyl glyoximide, vinylmagnesium bromide, and nitroalkenes is described. The reaction occurs with complete regio- and diastereocontrol in good yield. The diastereoselectivity is induced by a rare instance of 1,7-chirality transfer that is hypothesized to arise from a trans-multihetero-decalin transition state.
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Affiliation(s)
- Gregory R. Boyce
- Department of Chemistry and Physics, Florida Gulf Coast University, Fort Myers, Florida 33965, United States
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
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30
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Jiang J, Liu H, Lu CD, Xu YJ. Diethyl Phosphite Initiated Coupling of α-Ketoesters with Imines for Synthesis of α-Phosphonyloxy-β-amino Acid Derivatives and Aziridine-2-carboxylates. Org Lett 2016; 18:880-3. [DOI: 10.1021/acs.orglett.6b00273] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jin Jiang
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
| | - Hui Liu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
| | - Chong-Dao Lu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
| | - Yan-Jun Xu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
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31
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Sun Z, Liu H, Zeng YM, Lu CD, Xu YJ. Silyllithium-Initiated Coupling of α-Ketoamides with tert-Butanesulfinylimines for Stereoselective Synthesis of Enantioenriched α-(Silyloxy)-β-amino Amides. Org Lett 2016; 18:620-3. [PMID: 26809848 DOI: 10.1021/acs.orglett.6b00006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A silyllithium-initiated coupling of α-ketoamides with tert-butanesulfinylimines was developed for the efficient, stereoselective synthesis of enantioenriched α-(silyloxy)-β-amino amides. Nucleophilic addition of silyllithium to α-ketoamides, followed by 1,2-Brook rearrangement, generates nucleophilic enolates, which are then intercepted by chiral imines to provide three-component coupling products. Use of α-ketoamides is critical for achieving high yields and diastereoselectivities in the resulting α-hydroxy-β-amino acid derivatives.
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Affiliation(s)
- Zhao Sun
- Department of Chemistry and Applied Chemistry, Changji University , Changji 831100, China
| | - Hui Liu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yong-Ming Zeng
- Department of Chemistry and Applied Chemistry, Changji University , Changji 831100, China
| | - Chong-Dao Lu
- Department of Chemistry and Applied Chemistry, Changji University , Changji 831100, China.,The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yan-Jun Xu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
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32
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Ruiz J, Karre N, Roisnel T, Chandrasekhar S, Grée R. From Protectedβ-Hydroxy Acylsilanes to Functionalized Silyl Enol Ethers and Applications in Mukaiyama Aldol Reactions. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501344] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Huang W, Liu H, Lu CD, Xu YJ. Diastereoselective synthesis of 2-methoxyimidoyloxiranes via dimethyl phosphite-mediated coupling of α-keto N-sulfinyl imidates with aldehydes. Chem Commun (Camb) 2016; 52:13592-13595. [DOI: 10.1039/c6cc07723d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A dimethyl phosphite-triggered coupling of α-keto N-tert-butylsulfinyl imidates with aldehydes provides access to enantioenriched 2-methoxyimidoyloxiranes with excellent diastereoselectivities.
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Affiliation(s)
- Wei Huang
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
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34
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Lin CY, Ma PJ, Sun Z, Lu CD, Xu YJ. Carbamoyl anion-initiated cascade reaction for stereoselective synthesis of substituted α-hydroxy-β-amino amides. Chem Commun (Camb) 2016; 52:912-5. [DOI: 10.1039/c5cc08118a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A carbamoyl anion-initiated cascade reaction with acylsilanes and imines allows rapid construction of substituted α-hydroxy-β-amino amides in high yields with excellent diastereoselectivities.
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Affiliation(s)
- Chao-Yang Lin
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Peng-Ju Ma
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Zhao Sun
- Department of Chemistry and Applied Chemistry
- Changji University
- Changji 831100
- China
| | - Chong-Dao Lu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Yan-Jun Xu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
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35
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Nikolaev A, Orellana A. Synthesis of α,β-Unsaturated Acylsilanes via Perrhenate-Catalyzed Meyer-Schuster Rearrangement of 1-Silylalkyn-3-ols. Org Lett 2015; 17:5796-9. [PMID: 26576952 DOI: 10.1021/acs.orglett.5b02909] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the synthesis of α,β-unsaturated acylsilanes via the perrhenate-catalyzed Meyer-Schuster rearrangement of 1-silylalkyn-3-ols. Propargylic alcohols derived from TES-acetylene and substituted benzaldehydes can be converted to acylsilanes using a combination of p-TSA·H(2)O and n-Bu(4)N·ReO(4), or Ph(3)SiOReO(3) in good yields. Some propargylic alcohols derived from ketones, as well as aliphatic and unsaturated aldehydes, can also be converted to acylsilanes; however, they were often prone to side reactions.
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Affiliation(s)
- Andrei Nikolaev
- Department of Chemistry, York University . 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada
| | - Arturo Orellana
- Department of Chemistry, York University . 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada
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36
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Tan C, Chen W, Mu X, Chen Q, Gong J, Luo T, Yang Z. Synthetic Progress toward Azadirachtins. 2. Enantio- and Diastereoselective Synthesis of the Right-Wing Fragment of 11-epi-Azadirachtin I. Org Lett 2015; 17:2338-41. [DOI: 10.1021/acs.orglett.5b00831] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ceheng Tan
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Wei Chen
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Xinpeng Mu
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Qi Chen
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Jianxian Gong
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Tuoping Luo
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science
(BNLMS) and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Zhen Yang
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science
(BNLMS) and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
- Key
Laboratory of Marine Drugs, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
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37
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Lin CY, Sun Z, Xu YJ, Lu CD. Synthesis of Aryl anti-Vicinal Diamines via Aza-Brook Rearrangement-Initiated Nucleophilic Addition of α-Silylamines to Imines. J Org Chem 2015; 80:3714-22. [DOI: 10.1021/acs.joc.5b00255] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chao-Yang Lin
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
| | - Zhao Sun
- Department
of Chemistry and Applied Chemistry, Changji University, Changji 831100, China
| | - Yan-Jun Xu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
| | - Chong-Dao Lu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
- Department
of Chemistry and Applied Chemistry, Changji University, Changji 831100, China
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38
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Ruiz J, Murthy AS, Roisnel T, Chandrasekhar S, Grée R. α-Hydroxyallylsilanes as Propionaldehyde Enolate Equivalents and Their Use toward Iterative Aldol Reactions. J Org Chem 2015; 80:2364-75. [DOI: 10.1021/acs.joc.5b00031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Johal Ruiz
- Université de Rennes 1, Institut des Sciences Chimiques
de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Akondi Srirama Murthy
- Université de Rennes 1, Institut des Sciences Chimiques
de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France
- CSIR-Indian Institute of Chemical Technology, Division
of Natural Product Chemistry, Hyderabad 500007, India
| | - Thierry Roisnel
- Université de Rennes 1, Institut des Sciences Chimiques
de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Srivari Chandrasekhar
- CSIR-Indian Institute of Chemical Technology, Division
of Natural Product Chemistry, Hyderabad 500007, India
| | - René Grée
- Université de Rennes 1, Institut des Sciences Chimiques
de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France
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39
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Marri G, Reddy JS, Ruiz J, Das S, Grée R. Stereoselective TiCl4-Mediated Aldol Reactions Starting from Acylsilanes. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403263] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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Jiang JL, Yao M, Lu CD. Efficient synthesis of α-quaternary α-hydroxy-β-amino esters via silyl glyoxylate-mediated three-component reactions. Org Lett 2013; 16:318-21. [PMID: 24308782 DOI: 10.1021/ol403388w] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient method has been developed for the enantioselective synthesis of fully protected α-quaternary α-hydroxy-β-amino esters via the coupling of three components: aryl Grignard reagents (or methyllithium), silyl glyoxylate, and N-tert-butanesulfinyl imines. This protocol enables successive formation of two C-C bonds and two adjacent chiral carbons with high stereocontrol in a one-pot operation.
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Affiliation(s)
- Jiu-Long Jiang
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China , and University of the Chinese Academy of Sciences , China
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42
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Corbett MT, Johnson JS. Dynamic kinetic asymmetric transformations of β-stereogenic α-ketoesters by direct aldolization. Angew Chem Int Ed Engl 2013; 53:255-9. [PMID: 24222195 DOI: 10.1002/anie.201306873] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Indexed: 11/11/2022]
Abstract
Dynamic kinetic asymmetric transformations (DyKAT) of racemic β-bromo-α-keto esters by direct aldolization of nitromethane and acetone provide access to fully substituted α-glycolic acid derivatives bearing a β-stereocenter. The aldol adducts are obtained in excellent yield with high relative and absolute stereocontrol under mild reaction conditions. Mechanistic studies determined that the reactions proceed through a facile catalyst-mediated racemization of the β-bromo-α-keto esters under a DyKAT Type I manifold.
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Affiliation(s)
- Michael T Corbett
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599 (USA) http://www.unc.edu/jsjgroup/Home.html
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43
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Corbett MT, Johnson JS. Dynamic Kinetic Asymmetric Transformations of β-Stereogenic α-Ketoesters by Direct Aldolization. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201306873] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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44
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Cirriez V, Rasson C, Riant O. Synthesis of Acylsilanes by Copper(I)-Catalyzed Addition of Silicon Nucleophiles onto Acid Derivatives. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300621] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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45
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Smirnov P, Mathew J, Nijs A, Katan E, Karni M, Bolm C, Apeloig Y, Marek I. One-Pot Zinc-Promoted Asymmetric Alkynylation/Brook-Type Rearrangement/Ene-Allene Cyclization: Highly Selective Formation of Three New Bonds and Two Stereocenters in Acyclic Systems. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201306749] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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46
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Smirnov P, Mathew J, Nijs A, Katan E, Karni M, Bolm C, Apeloig Y, Marek I. One-Pot Zinc-Promoted Asymmetric Alkynylation/Brook-Type Rearrangement/Ene-Allene Cyclization: Highly Selective Formation of Three New Bonds and Two Stereocenters in Acyclic Systems. Angew Chem Int Ed Engl 2013; 52:13717-21. [DOI: 10.1002/anie.201306749] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 10/01/2013] [Indexed: 11/11/2022]
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47
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Reddy GP, Reddy JS, Das S, Roisnel T, Yadav JS, Chandrasekhar S, Grée R. Synthesis of Acylsilanes via Nickel-Catalyzed Reactions of α-Hydroxyallylsilanes. Org Lett 2013; 15:1524-7. [DOI: 10.1021/ol4003064] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gangireddy PavanKumar Reddy
- Université de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France, and CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - J. Satyanarayana Reddy
- Université de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France, and CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Saibal Das
- Université de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France, and CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Thierry Roisnel
- Université de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France, and CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Jhillu S. Yadav
- Université de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France, and CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Srivari Chandrasekhar
- Université de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France, and CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - René Grée
- Université de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France, and CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
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48
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Slade MC, Johnson JS. Alternaric acid: formal synthesis and related studies. Beilstein J Org Chem 2013; 9:166-72. [PMID: 23399952 PMCID: PMC3566800 DOI: 10.3762/bjoc.9.19] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 12/20/2012] [Indexed: 01/26/2023] Open
Abstract
A silyl glyoxylate three-component-coupling methodology has been exploited to achieve a formal synthesis, an analogue to an intermediate in a distinct formal synthetic route, and a third (unique) approach to the natural product alternaric acid. Highlighted in this study is the versatility of silyl glyoxylates to engage a variety of nucleophile and electrophile pairs to provide wide latitude in the approach to complex molecule synthesis.
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Affiliation(s)
- Michael C Slade
- Caudill Laboratories, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
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49
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Mahajan S, Singh IP. Determining and reporting purity of organic molecules: why qNMR. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:76-81. [PMID: 23233454 DOI: 10.1002/mrc.3906] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 11/06/2012] [Accepted: 11/08/2012] [Indexed: 06/01/2023]
Abstract
Although NMR has been routinely used to determine/estimate relative number of protons for structure elucidation, it has been rarely used to determine and report the purity of organic compounds. Through this paper, we want to emphasize on routine use of quantitative NMR (qNMR) for this purpose. The results of qNMR can be routinely considered as documentation of purity much like other established methods (HPLC, elemental analysis and differential scanning calorimetry). qNMR is a fast, easy, accurate and non-destructive alternate to speed up the whole analytical process and serves the purpose of both identification and purity determination of compounds using single technique.
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Affiliation(s)
- Shivani Mahajan
- Department of Natural Products, National Institute of Pharmaceutical Education and Research, SAS Nagar, Punjab, India
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50
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Zhang HJ, Priebbenow DL, Bolm C. Acylsilanes: valuable organosilicon reagents in organic synthesis. Chem Soc Rev 2013; 42:8540-71. [DOI: 10.1039/c3cs60185d] [Citation(s) in RCA: 168] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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