O-Protecting groups as long-range stereocontrolling elements in the addition of acetylides to 4-substituted quinolines
作者:Giuseppe Guanti、Sara Perrozzi、Renata Riva
DOI:10.1016/s0957-4166(02)00711-5
日期:2002.12
Addition of magnesium acetylides in the presence of chloroformate esters to racemic differently O-protected 2-(4-quinolyl)propanols and to enantiopure 2-(4-quinolyl)-1,3-dialkoxypropanes, prepared by a chemoenzymatic route, gives almost exclusive regioselective attack at C-2, with stereoselectivities from moderate to good, depending mainly on the bulkiness of the O-protecting group present. (C) 2002 Elsevier Science Ltd. All rights reserved.