SYNTHESIS OF 1,3-DIIMINOISOINDOLINES FROM 2-CYANOBENZALDEHYDE. REACTION OF<i>N</i>-(2-CYANOBENZYLIDENE)ANILINES WITH ELEMENTAL SULFUR IN LIQUID AMMONIA AND AMINES
Various 1,3-diimonoisoindolines were obtained by treating N-(2-cyanobenzylidene)anilines with elemental sulfur in liquid ammonia and amines. A novel route to isoindoline from 2-cyanobenzaldehyde was developed.
SiCl4 is an efficient and selective catalyst for the vinylogous Mannich reaction of linear and cyclic synthetic equivalents of acetoacetate dianion, leading to delta-amino-beta-ketoesters in moderate to high yields and complete gamma-selectivity; anti-diastereoselectivity was observed by using a gamma-methyl-substituted cyclic silyloxydiene. (c) 2007 Elsevier Ltd. All rights reserved.