Stereocontrolled synthesis of (-)-prezizanol,(-)-prezizaene, their epimers and (-)-allokhusiol
作者:Kazutoshi Sakurai、Takeshi Kitahara、Kenji Mori
DOI:10.1016/s0040-4020(01)81359-4
日期:1990.1
(-)-Prezizanol (-)-1, (-)-prezizaene (-)-2, isolated from Diels, and their epimers, 5 and 6, were synthesized employing β-keto ester 7, readily available from ()-(+)-pulegone, as a starting material. -Epimers, 5 and 6 were obtained with over 95 % stereoselectivity reductive methylation of enone 22. The natural isomers, (-)-1 and (-)-2, were synthesized hydroxy-directed hydrogenation of the corresponding allylic
( - ) - Prezizanol( - ) - 1,( - ) - prezizaene( - ) - 2,从分离的狄尔斯,及其差向异构体,5和6,合成采用β酮酯7,可容易地从() - ( +)-pulegone,作为起始原料。-表异构体5和6获得了烯酮22的95%以上的立体选择性还原甲基化。天然异构体(-)- 1和(-)- 2是用均相催化剂对相应的烯丙醇40进行羟基定向氢化而合成的。