Synthesis of cis-2-aryl-3-pyrrolidine carboxylic esters via diastereoselective cyclization of γ-imino esters using a TiCl4/Et3N reagent system
摘要:
Facile synthesis of cis-2-aryl-3-pyrrolidine carboxylates from readily accessible gamma-imino esters by intramolecular cyclization mediated by a TiCl4/Et3N reagent system is described. (C) 2004 Elsevier Ltd. All rights reserved.
The Cyano Group as a Traceless Activation Group for the Intermolecular [3+2] Cycloaddition of Azomethine Ylides: A Five-Step Synthesis of (±)-Isoretronecanol
The cyano group was used as a traceless activation group for the [3+2] cycloaddition of azomethine ylides in a two‐step process, thereby providing a highly effective approach to 5‐unsubstituted pyrrolidines. The transformation includes the silver acetate catalyzed intermolecular 1,3‐dipolarcycloaddition of α‐iminonitriles and an unprecedented sodium borohydride induced reductive decyanation reaction