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Catalytic asymmetric [3 + 2]-cycloaddition for stereodivergent synthesis of chiral indolyl-pyrrolidines†
Takayoshi Arai,Chihiro Tokumitsu,Tomoya Miyazaki,Satoru Kuwano,Atsuko Awata
Organic & Biomolecular Chemistry Pub Date : 01/04/2016 00:00:00 , DOI:10.1039/C5OB02278A
Abstract

The stereochemical divergent synthesis of indolyl-pyrrolidines was accomplished using an imidazoline-aminophenol (IAP)–Ni(OAc)2 complex and a bis(imidazolidine)pyridine (PyBidine)–Cu(OTf)2 complex. The former catalyzed exo′-selective asymmetric [3 + 2] cyclization of iminoesters with indolyl nitroalkenes, and the latter catalyzed the reaction in an endo-selective manner. These catalysts are tolerant toward highly functional substrates that supply chiral indolyl-pyrrolidine hybrids.

Graphical abstract: Catalytic asymmetric [3 + 2]-cycloaddition for stereodivergent synthesis of chiral indolyl-pyrrolidines
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