Highly stereoselective ring opening reaction of tropone oxime tosylate with nucleophiles
作者:Takahisa Machiguchi、Toshio Hasegawa、Megumi Ohno、Yoshio Kitahara、Makoto Funamizu、Tetsuo Nozoe
DOI:10.1039/c39880000838
日期:——
The tosylate (1) of tropone oxime undergoes a novel ring-opening reaction under mild conditions with secondary amines, alkoxides, and Grignard reagents affording stereoselectively 6-substituted (1Z,3Z,5Z)-hexa-1,3,5-triene-carbonitriles (2a–h) as sole products in high yields; these are easily converted into Z,Z,E-isomers (3a–h) with acids and further into E,E,E-isomers (4a–h) as the final form by stronger
托酮肟的甲苯磺酸盐(1)在温和条件下与仲胺,醇盐和格利雅试剂进行新型开环反应,从而提供立体选择性6取代(1 Z,3 Z,5 Z)-己基1,3,5 -三烯-腈(2a–h)作为高产的唯一产品;这些可以很容易地用酸转化为Z,Z,E异构体(3a–h),并通过强酸或将溶液通过一柱色谱柱进一步转化为E,E,E异构体(4a–h)作为最终形式。氧化铝。