A Novel Asymmetric Synthesis of the Core Octadienoic Acid Unit of Cryptophycins from (R)-2,3-O-Cyclohexylideneglyceraldehyde
作者:Subrata Chattopadhyay、Dibakar Goswami、Payel Sur、Angshuman Chattopadhyay、Anubha Sharma
DOI:10.1055/s-0030-1260014
日期:2011.5
A facile asymmetric synthesis of the octadienoic acid unit of cryptophycins was developed starting from (R)-2,3-O-cyclohexylideneglyceraldehyde. The key steps of the synthesis are the stereocontrolled generation of the required asymmetric centers through (i) a gallium-mediated highly diastereoselective crotylation of the glyceraldehyde in [bmim][Br], (ii) a stereoselective allylation with allyltributylstannane
从(R)-2,3- O-环己叉基甘油醛开始开发了一种隐藻霉素的辛二烯酸单元的简便不对称合成方法。合成的关键步骤是通过(i)镓介导的[bmim] [Br]中甘油醛的非对映选择性crotylation立体控制生成所需的不对称中心,(ii)用烯丙基三丁基锡烷进行立体选择性烯丙基化,以及(iii) α-氧化醛中的对映选择性格氏试剂。 不对称合成-手性池-隐藻素-镓-丁酰化-烯丙基化