Asymmetric Palladium-Catalyzed Carboamination Reactions for the Synthesis of Enantiomerically Enriched 2-(Arylmethyl)- and 2-(Alkenylmethyl)pyrrolidines
作者:Duy N. Mai、John P. Wolfe
DOI:10.1021/ja106989h
日期:2010.9.8
The enantioselective synthesis of 2-(arylmethyl)- and 2-(alkenylmethyl)pyrrolidine derivatives via Pd-catalyzed alkenecarboaminationreactions is described. These transformations generate enantiomericallyenriched products with up to 94% ee from readily available alkenyl or aryl bromides and N-boc-pent-4-enylamines. The application of this method to a concise asymmetricsynthesis of (-)-tylophorine
In Situ trapping of Boc-2-pyrrolidinylmethylzinc Iodide with Aryl Iodides: Direct Synthesis of 2-Benzylpyrrolidines
作者:Ahmad Reza Massah、Andrew J. Ross、Richard F. W. Jackson
DOI:10.1021/jo101503p
日期:2010.12.3
Addition of (S)-(+)-tert-butyl 2-(iodomethyl)pyrrolidine-1-carboxylate to activated zinc, aryl halides, and a catalyst derived from Pd-2(dba)(3) (2.5 mol %) and SPhos (5 mol %) in DMF allows trapping of the corresponding organozinc reagent, with formation of Boc-protected 2-benzylpyrrolidines (20-72%).