(R)-(4-(Benzyloxycarbonylphenyl)-3-hydroxy-4,4-dimethyl-2-pyrrolidinone) acrylate derivative as a chiral dienophile for the synthesis of enantiopure 2-aminocyclohexane carboxylic acids
作者:Monique Calmès、Claude Didierjean、Jean Martinez、Olivier Songis
DOI:10.1016/j.tetasy.2005.05.024
日期:2005.6
An asymmetric Diels-Alder reaction between the enantiopure (R)-benzyl-4-(3-acryloyloxy-4,4-dimethyl-2-oxopyrrolidin-1-yl)-benzoate (R)-2 and the N-Z-aminodiene 3 proceeded with total endo diastereoselectivity and was facially controlled in favour of the (3'R,1R,2S)-adduct. The two adducts obtained, 4 (the main compound) and 5, were isolated pure after Column chromatography on silica gel. Their LiOH hydrolysis followed by palladium-catalyzed hydrogenation of the double bond concomitant with hydrogenolysis of the carbamate moiety yielded the enantiopure cis-2-aminocyclohexane carboxylic acids (1R,2S)-8 and (1S,2R)-8. (c) 2005 Elsevier Ltd. All rights reserved.