Acyclic stereoselection. Part 42. 1,4- and 1,5-Stereoselection by sequential aldol addition to a .alpha.,.beta.-unsaturated aldehydes followed by Claisen rearrangement. Application to total synthesis of the vitamin E side chain and the archaebacterial C40 diol
Allylicalcohols were selectively oxidized into aldehydes or ketones using a Pd(OAc) 2 -Et 3 N-O 2 system. Diols with one -allylic function were selectively oxidized, with one of the hydroxyl groups remaining untouched.
使用 Pd(OAc) 2 -Et 3 NO 2 系统将烯丙醇选择性氧化成醛或酮。具有单烯丙基官能团的二醇被选择性氧化,其中一个羟基保持不变。
Acyclic stereoselection. 15. Sequential aldol-claisen as a method for 1,5-stereoselection. Total synthesis of the vitamin-E side chain
作者:Clayton H. Heathcock、Esa T. Jarvi
DOI:10.1016/s0040-4039(00)88423-3
日期:1982.1
Alcohol1, the side chain of α-tocopherol, has been synthesized in a stereoselective route involving an aldol condensation-Claisen rearrangement sequence. The synthesis require 11 steps and produces1in 17% overall yield. A complementary sequence employing reagent14provides isomer18.