1
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A novel protocol involving Huisgen zwitterions for the synthesis of bispyrazolines, and highly functionalized pyrazolines. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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Regier J, Ghanty S, Bolshan Y. Stereoselective Palladium-Catalyzed Arylation of Exo-Glycals with Aryl Iodides. J Org Chem 2021; 87:524-530. [PMID: 34958570 DOI: 10.1021/acs.joc.1c02533] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel methodology for the arylation of exo-glycals has been developed. A range of exo-glycals underwent reactions with aryl iodides in the presence of a palladium catalyst. The transformation proceeded in a stereoselective manner to afford Z-isomers. The developed transformation demonstrated excellent functional group tolerance.
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Affiliation(s)
- Jeffery Regier
- Faculty of Science, Ontario Tech University, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada
| | - Supriya Ghanty
- Faculty of Science, Ontario Tech University, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada
| | - Yuri Bolshan
- Faculty of Science, Ontario Tech University, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada
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3
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Huang Y, Liao J, Wang W, Liu H, Guo H. Synthesis of heterocyclic compounds through nucleophilic phosphine catalysis. Chem Commun (Camb) 2020; 56:15235-15281. [PMID: 33320123 DOI: 10.1039/d0cc05699e] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Nucleophilic phosphine catalysis is a practical and powerful tool for the synthesis of various heterocyclic compounds with the advantages of environmentally friendly, metal-free, and mild reaction conditions. The present report summarizes the construction of four to eight-membered heterocyclic compounds containing nitrogen, oxygen and sulphur atoms through phosphine-catalyzed intramolecular annulations and intermolecular [2+2], [3+2], [4+1], [3+1+1], [5+1], [4+2], [2+2+2], [3+3], [4+3] and [3+2+3] annulations of electron-deficient alkenes, allenes, alkynes and Morita-Baylis-Hillman carbonates.
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Affiliation(s)
- Yifan Huang
- Department of Chemistry and Innovation Center of Pesticide Research, China Agricultural University, Beijing 100193, China.
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4
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Kumar H, Prajapati G, Dubey A, Ampapathi RS, Mandal PK. Intramolecular 6- exo- dig Post-Ugi Cyclization of N-Substituted 2-Alkynamides: Direct Access to Functionalized Morpholinone Glycoconjugates. Org Lett 2020; 22:9258-9262. [PMID: 33202129 DOI: 10.1021/acs.orglett.0c03486] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We herein report a chemo- and regioselective 6-exo-dig catalytic cyclization of Ugi adducts N-substituted 2-alkynamides to access functionalized morpholinone glycoconjugates in the presence of triphenylphosphine. This array allows an interesting multicomponent access to a library of functionalized morpholinone glycoconjugates under mild reaction conditions with regeneration of catalyst triphenylphosphine, supported by 31P nuclear magnetic resonance studies. Density functional theory shows the 6-exo-dig oxocyclization pathway is preferred, which supports our experimental observation.
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5
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Zhang K, Cai L, Hong S, Kwon O. Phosphine-Catalyzed α-Umpolung-Aldol Reaction for the Synthesis of Benzo[ b]azapin-3-ones. Org Lett 2019; 21:5143-5146. [PMID: 31247774 PMCID: PMC7338222 DOI: 10.1021/acs.orglett.9b01749] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A novel phosphine-catalyzed intermolecular cyclization between 2-sulfonamidobenzaldehyes and ynones is reported. This methodology serves as a conduit for the construction of benzo[ b]azepin-3-ones in good to excellent yields under mild conditions. The resulting 2-benzylidene moieties are formed exclusively in the E-configuration. Mechanistically, this unusual annulation occurs through a phosphine-catalyzed α-umpolung addition, followed by an aldol reaction. One of the benzo[ b]azepin-3-one products was converted to the core structure of 3-amino-[ a]benzazepin-2-one-1-alkanoic acids, many of which function as angiotensin-converting enzyme inhibitors.
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Affiliation(s)
- Kui Zhang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
| | - Lingchao Cai
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
| | - Sooji Hong
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
| | - Ohyun Kwon
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
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6
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Ranjan P, Ojeda GM, Sharma UK, Van der Eycken EV. Metal‐Free Dearomatization: Direct Access to Spiroindol(en)ines in Batch and Continuous‐Flow. Chemistry 2019; 25:2442-2446. [DOI: 10.1002/chem.201805945] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Indexed: 01/01/2023]
Affiliation(s)
- Prabhat Ranjan
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)Department of ChemistryUniversity of Leuven (KU Leuven) Celestijnenlaan 200F 3001 Leuven Belgium
| | - Gerardo M. Ojeda
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)Department of ChemistryUniversity of Leuven (KU Leuven) Celestijnenlaan 200F 3001 Leuven Belgium
- Center for Natural Products ResearchFaculty of ChemistryUniversity of Havana, ZapatayG 10400 Havana Cuba
| | - Upendra K. Sharma
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)Department of ChemistryUniversity of Leuven (KU Leuven) Celestijnenlaan 200F 3001 Leuven Belgium
| | - Erik V. Van der Eycken
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)Department of ChemistryUniversity of Leuven (KU Leuven) Celestijnenlaan 200F 3001 Leuven Belgium
- People's Friendship University of RussiaRUDN University) Miklukho -Maklaya street 6 117198 Moscow Russia
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7
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Huang G, Ren X, Jiang C, Wu JH, Gao G, Wang T. Efficient synthesis of (E)-2-nitromethylcinnamatesviaphosphine-catalyzed tandem α-addition and 1,3-rearrangement. Org Chem Front 2019. [DOI: 10.1039/c9qo00478e] [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
An efficient synthetic approach for accessing (E)-2-nitromethylcinnamatesviaa phosphine-promoted tandem reaction between substituted nitromethanes and alkynes has been developed.
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Affiliation(s)
- Guofei Huang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Xiaoyu Ren
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Chunhui Jiang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Jia-Hong Wu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Guowei Gao
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Tianli Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
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8
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Abstract
The hallmark of nucleophilic phosphine catalysis is the initial nucleophilic addition of a phosphine to an electrophilic starting material, producing a reactive zwitterionic intermediate, generally under mild conditions. In this Review, we classify nucleophilic phosphine catalysis reactions in terms of their electrophilic components. In the majority of cases, these electrophiles possess carbon-carbon multiple bonds: alkenes (section 2), allenes (section 3), alkynes (section 4), and Morita-Baylis-Hillman (MBH) alcohol derivatives (MBHADs; section 5). Within each of these sections, the reactions are compiled based on the nature of the second starting material-nucleophiles, dinucleophiles, electrophiles, and electrophile-nucleophiles. Nucleophilic phosphine catalysis reactions that occur via the initial addition to starting materials that do not possess carbon-carbon multiple bonds are collated in section 6. Although not catalytic in the phosphine, the formation of ylides through the nucleophilic addition of phosphines to carbon-carbon multiple bond-containing compounds is intimately related to the catalysis and is discussed in section 7. Finally, section 8 compiles miscellaneous topics, including annulations of the Hüisgen zwitterion, phosphine-mediated reductions, iminophosphorane organocatalysis, and catalytic variants of classical phosphine oxide-generating reactions.
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Affiliation(s)
- Hongchao Guo
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Yi Chiao Fan
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569, USA
| | - Zhanhu Sun
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Yang Wu
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Ohyun Kwon
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569, USA
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9
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Kaszás T, Ivanov A, Tóth M, Ehlers P, Langer P, Somsák L. Pd-catalyzed coupling reactions of anhydro-aldose tosylhydrazones with aryl bromides to produce substituted exo-glycals. Carbohydr Res 2018; 466:30-38. [PMID: 29499901 DOI: 10.1016/j.carres.2018.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 02/16/2018] [Accepted: 02/16/2018] [Indexed: 12/14/2022]
Abstract
Palladium-catalyzed cross-couplings of O-peracylated and O-permethylated 2,6-anhydro-aldose tosylhydrazones with aryl halides were studied under thermic conditions in the presence of LiOtBu and phosphine ligands. The reactions gave the corresponding aryl substituted exo-glycals as mixtures of diastereomers in 11-75% yields. The transformations represent a new access to these types of glycomimetic compounds. The double bond of some aryl substituted exo-glycals was saturated to give good yields of benzylic C-glycosyl derivatives.
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Affiliation(s)
- Tímea Kaszás
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary; Department of Chemistry, University of Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
| | - Anton Ivanov
- Department of Chemistry, University of Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
| | - Marietta Tóth
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary
| | - Peter Ehlers
- Department of Chemistry, University of Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
| | - Peter Langer
- Department of Chemistry, University of Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
| | - László Somsák
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary.
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10
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Heterocycles Incorporating a Pentacoordinated, Hypervalent Phosphorus Atom. ADVANCES IN HETEROCYCLIC CHEMISTRY 2018. [DOI: 10.1016/bs.aihch.2017.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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11
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Sun G, Wei M, Luo Z, Liu Y, Chen Z, Wang Z. An Alternative Scalable Process for the Synthesis of the Key Intermediate of Omarigliptin. Org Process Res Dev 2016. [DOI: 10.1021/acs.oprd.6b00295] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guodong Sun
- HEC Research and Development
Center, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Mingjie Wei
- HEC Research and Development
Center, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Zhonghua Luo
- HEC Research and Development
Center, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Yongjun Liu
- HEC Research and Development
Center, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Zhijun Chen
- HEC Research and Development
Center, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Zhongqing Wang
- HEC Research and Development
Center, HEC Pharm Group, Dongguan 523871, P. R. China
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12
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Diels–Alder reaction of two green chiral precursors. Approach to natural product like structures. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.09.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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13
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Vannam R, Peczuh MW. How to Homologate Your Sugar: Synthetic Approaches to Septanosyl Containing Carbohydrates. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600052] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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14
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Lorenc C, Saurí J, Moser A, Buevich AV, Williams AJ, Williamson RT, Martin GE, Peczuh MW. Turning Spiroketals Inside Out: A Rearrangement Triggered by an Enol Ether Epoxidation. ChemistryOpen 2015; 4:577-80. [PMID: 26491634 PMCID: PMC4608522 DOI: 10.1002/open.201500122] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Indexed: 11/07/2022] Open
Abstract
Spiroketals organize small molecule structures into well-defined, three-dimensional configurations that make them good ligands of proteins. We recently discovered a tandem cycloisomerization-dimerization reaction of alkynyl hemiketals that delivered polycyclic, enol-ether-containing spiroketals. Here we describe rearrangements of those compounds, triggered by epoxidation of their enol ethers that completely remodel their structures, essentially turning them "inside out". Due to the high level of substitution on the carbon skeletons of the substrates and products, characterization resorted to X-ray crystallography and advanced computation and NMR techniques to solve the structures of representative compounds. In particular, a new proton-detected ADEQUATE NMR experiment (1,1-HD-ADEQUATE) enabled the unequivocal assignment of the carbon skeleton of one of the new compounds. Solution of the structures of the representative compounds allowed for the assignment of product structures for the other compounds in two separate series. Both the rearrangement and the methods used for structural determination of the products are valuable tools for the preparation of characterization of new small molecule compounds.
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Affiliation(s)
- Chris Lorenc
- Department of Chemistry, University of Connecticut55 N. Eagleville Road, U3060, Storrs, CT, 06269, USA
| | - Josep Saurí
- Process & Analytical Chemistry, NMR Structure Elucidation, Merck Research LaboratoriesRahway, NJ, 07065, USA
| | - Arvin Moser
- Advanced Chemistry Development, Inc.8 King Street E. Suite 107, Toronto, ON, M5C 1B5, Canada
| | - Alexei V Buevich
- Process & Analytical Chemistry, NMR Structure Elucidation, Merck Research LaboratoriesRahway, NJ, 07065, USA
| | | | - R Thomas Williamson
- Process & Analytical Chemistry, NMR Structure Elucidation, Merck Research LaboratoriesRahway, NJ, 07065, USA
| | - Gary E Martin
- Process & Analytical Chemistry, NMR Structure Elucidation, Merck Research LaboratoriesRahway, NJ, 07065, USA
| | - Mark W Peczuh
- Department of Chemistry, University of Connecticut55 N. Eagleville Road, U3060, Storrs, CT, 06269, USA
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15
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Pradhan TK, Lin CC, Mong KKT. Preparation of a protected 3-deoxy-D-manno-oct-2-ulosonate glycal donor for the synthesis of β-KDO-containing oligosaccharides. Org Lett 2014; 16:1474-7. [PMID: 24571125 DOI: 10.1021/ol500275j] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A practical method for the synthesis of KDO glycal donors was developed. The prepared KDO donors exhibited excellent disastereoselectivity of glycosylation in a CH2Cl2-CH3CN solvent mixture, which was found to be associated with the isopropylidene protection at the C-4 and C-5 hydroxyls. The synthetic use of the KDO donor was demonstrated in the preparation of β-KDO-containing oligosaccharides.
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Affiliation(s)
- Tapan Kumar Pradhan
- Applied Chemistry Department, National Chiao Tung University , 1001 Ta Hsueh Road, Taiwan
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16
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Ranade A, Georg GI. Enantioselective synthesis of 3,4-dihydro-1,2-oxazepin-5(2H)-ones and 2,3-dihydropyridin-4(1H)-ones from β-substituted β-hydroxyaminoaldehydes. J Org Chem 2014; 79:984-92. [PMID: 24785413 PMCID: PMC3985460 DOI: 10.1021/jo402445r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2013] [Indexed: 12/12/2022]
Abstract
The synthesis of 3,4-dihydro-1,2-oxazepin-5(2H)-ones and 2,3-dihydropyridin-4(1H)-ones from β-substituted β-hydroxyaminoaldehydes is reported. The β-hydroxyaminoaldehydes were prepared by enantioselective organocatalytic 1,4-addition of N-tert-butyl (tert-butyldimethylsilyl)oxycarbamate to α,β-unsaturated aldehydes (MacMillan protocol). Alkyne addition to the aldehydes followed by alcohol oxidation furnished N-Boc O-TBS-protected β-aminoynones. Removal of the TBS protecting group initiated a 7-endo-dig cyclization to yield previously unknown 3,4-dihydro-1,2-oxazepin-5(2H)-ones. Reductive cleavage of the N-O bond of the oxazepinones and Boc-deprotection provided 2-substituted 2,3-dihydropyridin-4(1H)-ones via 6-endo-trig cyclization. 2,3-Dihydropyridin-4(1H)-ones are versatile intermediates that have been used for the synthesis of many alkaloids. The new protocol allows the synthesis of 3-dihydropyridin-4(1H)-ones carrying an array of substituents at C2 that cannot be prepared from commercial β-amino acids or by one-carbon homologation of proteinogenic amino acids. The use of readily available β-hydroxylaminoaldehydes expands the utility of our previously reported method to prepare 2,3-dihydropyridin-4(1H)-ones from β-amino acids as the source of diversity and chirality. A broad substrate scope is possible because β-aminoaldehydes can be prepared from α,β-unsaturated aldehydes by an enantioselective organocatalytic process.
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Affiliation(s)
- Adwait
R. Ranade
- University
of Kansas, 1251 Wescoe
Hall Drive, 4070 Malott
Hall, Lawrence, Kansas 66045-7482, United States
- Department of Medicinal
Chemistry
and Institute for Therapeutics Discovery & Development, University of Minnesota, 717 Delaware Street South East, Minneapolis, Minnesota 55414, United States
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17
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Vannam R, Peczuh MW. Synthesis of C-Septanosides from Pyranoses via Vinyl Addition and Electrophilic Cyclization. Org Lett 2013; 15:4122-5. [DOI: 10.1021/ol401769k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Raghu Vannam
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U-3060, Storrs, Connecticut 06269, United States
| | - Mark W. Peczuh
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U-3060, Storrs, Connecticut 06269, United States
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