Stereoselective synthesis of 1,4-disubstituted 1,3-diene from aldehyde using organotitanium reagent
作者:Yoshihiko Ikeda、Junzo Ukai、Nobuo Ikeda、Hisashi Yamamoto
DOI:10.1016/s0040-4020(01)90007-9
日期:——
Organotitanium reagent generated from 1-t-butylthio-3-trimethylsilyl-1-propene condenses with aldehydes to give 1 -t-butylthio-(E,Z)-1,3-alkadienes in a single step via (E)-erythro-β-hydroxysilane in a highly regio- and stereoselective manner. 1,4-Dialkyl-1,3-diene is obtaind from the diene sulfide by cross coupling reaction with Grignard reagent in the presence of nickel catalyst. The utility of the
由1-叔丁基硫代-3-三甲基甲硅烷基-1-丙烯生成的有机钛试剂与醛缩合,可通过(E)-赤藓基-单步合成1-叔丁硫基-(E,Z)-1,3-链二烯。 β-羟基硅烷具有高度区域选择性和立体选择性。在镍催化剂的存在下,通过与格氏试剂的交叉偶联反应,由二烯硫醚得到1,4-二烷基-1,3-二烯。该方法的实用性通过在五个步骤中应用于从蛇兰香中天然合成的杀虫剂斯皮兰特的合成中得到说明。