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Lam H, Qureshi Z, Wegmann M, Lautens M. Transition‐Metal‐Free [4+3]‐Cycloaddition of
ortho
‐Quinone Methides and Isomünchnones: Catalytic and Diastereoselective Assembly of Oxa‐bridged Oxazocine Scaffolds. Angew Chem Int Ed Engl 2018; 57:16185-16189. [DOI: 10.1002/anie.201810760] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Heather Lam
- Davenport LaboratoriesDepartment of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Zafar Qureshi
- Davenport LaboratoriesDepartment of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Marcus Wegmann
- Davenport LaboratoriesDepartment of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Mark Lautens
- Davenport LaboratoriesDepartment of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
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Lam H, Qureshi Z, Wegmann M, Lautens M. Transition‐Metal‐Free [4+3]‐Cycloaddition of
ortho
‐Quinone Methides and Isomünchnones: Catalytic and Diastereoselective Assembly of Oxa‐bridged Oxazocine Scaffolds. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810760] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Heather Lam
- Davenport LaboratoriesDepartment of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Zafar Qureshi
- Davenport LaboratoriesDepartment of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Marcus Wegmann
- Davenport LaboratoriesDepartment of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Mark Lautens
- Davenport LaboratoriesDepartment of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
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Zhang JQ, Qi ZH, Yin SJ, Li HY, Wang Y, Wang XW. Brønsted or Lewis Acid Initiated Multicomponent Cascade Reaction: Diastereoselective Synthesis of Imidazolidinyl Spirooxindole Derivatives. ChemCatChem 2016. [DOI: 10.1002/cctc.201600560] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jun-Qi Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou 215123 P.R. China
| | - Zheng-Hang Qi
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou 215123 P.R. China
| | - Shao-Jie Yin
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou 215123 P.R. China
| | - Hai-Yan Li
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou 215123 P.R. China
| | - Yong Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou 215123 P.R. China
| | - Xing-Wang Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou 215123 P.R. China
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Jiang J, Xu HD, Xi JB, Ren BY, Lv FP, Guo X, Jiang LQ, Zhang ZY, Hu WH. Diastereoselectively Switchable Enantioselective Trapping of Carbamate Ammonium Ylides with Imines. J Am Chem Soc 2011; 133:8428-31. [DOI: 10.1021/ja201589k] [Citation(s) in RCA: 197] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jun Jiang
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Hua-Dong Xu
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Jian-Bei Xi
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Bai-Yan Ren
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Feng-Ping Lv
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Xin Guo
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Li-Qin Jiang
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Zhi-Yong Zhang
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Wen-Hao Hu
- Department of Chemistry, ‡Institute of Drug Discovery and Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
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Troyer TL, Muchalski H, Hong KB, Johnston JN. Origins of selectivity in Brønsted acid-promoted diazoalkane-azomethine reactions (the aza-Darzens aziridine synthesis). Org Lett 2011; 13:1790-2. [PMID: 21366339 DOI: 10.1021/ol200313m] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The mechanism of the Brønsted acid-catalyzed aza-Darzens reaction is explored by charting the stereochemical outcome of the triflic acid-promoted conversion of trans-triazolines to cis-aziridines. These experiments are consistent with the intermediacy of an α-diazonium-β-amino ester intermediate.
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Affiliation(s)
- Timothy L Troyer
- Department of Chemistry & Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235-1822, United States
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Barbazanges M, Meyer C, Cossy J, Turner P. Synthesis of 1,2‐Amino Alcohols by Sigmatropic Rearrangements of 3‐(N‐Tosylamino)allylic Alcohol Derivatives. Chemistry 2011; 17:4480-95. [DOI: 10.1002/chem.201003265] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Indexed: 01/26/2023]
Affiliation(s)
- Marion Barbazanges
- Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS (UMR 7084), 10 rue Vauquelin 75231 Paris Cedex 05 (France), Fax: (+33) 140‐79‐46‐60
| | - Christophe Meyer
- Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS (UMR 7084), 10 rue Vauquelin 75231 Paris Cedex 05 (France), Fax: (+33) 140‐79‐46‐60
| | - Janine Cossy
- Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS (UMR 7084), 10 rue Vauquelin 75231 Paris Cedex 05 (France), Fax: (+33) 140‐79‐46‐60
| | - Peter Turner
- GlaxoSmithKline Stevenage, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG12NY (UK)
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Muchalski H, Hong KB, Johnston JN. Brønsted acid-promoted azide-olefin [3 + 2] cycloadditions for the preparation of contiguous aminopolyols: The importance of disiloxane ring size to a diastereoselective, bidirectional approach to zwittermicin A. Beilstein J Org Chem 2010; 6:1206-10. [PMID: 21283562 PMCID: PMC3028999 DOI: 10.3762/bjoc.6.138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 11/24/2010] [Indexed: 11/23/2022] Open
Abstract
We report the first study of substrate-controlled diastereoselection in a double [3 + 2] dipolar cycloaddition of benzyl azide with α,β-unsaturated imides. Using a strong Brønsted acid (triflic acid) to activate the electron deficient imide π-bond, high diastereoselection was observed provided that a 1,1,3,3-tetraisopropoxydisiloxanylidene group (TIPDS) is used to restrict the conformation of the central 1,3-anti diol. This development provides a basis for a stereocontrolled approach to the aminopolyol core of (-)-zwittermicin A using a bidirectional synthesis strategy.
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Affiliation(s)
- Hubert Muchalski
- Vanderbilt University and Vanderbilt Institute of Chemical Biology, Nashville, TN 37235, United States
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Johnston J, Muchalski H, Troyer T. To Protonate or Alkylate? Stereoselective Brønsted Acid Catalysis of CC Bond Formation Using Diazoalkanes. Angew Chem Int Ed Engl 2010; 49:2290-8. [DOI: 10.1002/anie.200904828] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Johnston J, Muchalski H, Troyer T. Protonierung oder Alkylierung? Stereoselektive Brønsted-Säure-katalysierte C-C-Verknüpfungen mit Diazoalkanen. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200904828] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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