Two practical routes for the synthesis of benzhydrylamine derivatives in enantiomerically pure form have been developed. N-Acetylbenzhydrylamines can be synthesised in few steps and good yields starting from 1-aryl-1-propargylamines. The key steps are represented by the alkene-alkyne cross metathesis reaction and alkyne–diene methylene-free tandem-metathesis reaction; these reactions have been performed
Microwave-assisted ethylene–alkyne cross-metathesis: synthesis of chiral 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes
作者:Daniele Castagnolo、Michela L. Renzulli、Elena Galletti、Federico Corelli、Maurizio Botta
DOI:10.1016/j.tetasy.2005.08.002
日期:2005.9
Chiral 1-arylpropargyl amides, which are resistant to undergoing ethylene-alkyne cross-metathesis at atmospheric pressure, were reacted under microwave irradiation to afford enantiomerically enriched 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes within a few minutes. Enantiomerically enriched amides underwent ethylene-alkyne cross-metathesis with retention of configuration at the propargylic/allylic position. A series of chiral 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes were synthesised with ee >= 95%; these latter compounds could be used as building blocks for the synthesis of new antifungal and antiaromatase agents. (c) 2005 Elsevier Ltd. All rights reserved.