Synthesis of solandelactone F, constanolactone A and an advanced intermediate towards solandelactone E from a common synthetic intermediate
作者:Raju Yalla、Sadagopan Raghavan
DOI:10.1039/c9ob00623k
日期:——
The stereoselective synthesis of solandelactone F, constanolactone A and an advanced intermediate towards solandelactone E, from a common synthetic intermediate, is disclosed. The propargylic sulfide stereocenter is created stereoselectively via carbon–carbon bond formation in the reaction of α-chloro sulfides with alkynylzinc reagents via 1,2-asymmetric induction by a β-siloxy group. The characteristic
公开了从普通的合成中间体立体选择性地合成索兰内酯F,康耐醇内酯A和向索兰内酯E的高级中间体。炔丙基硫化物的立体中心是通过α-氯代硫化物与炔基锌试剂通过β-甲硅烷氧基的1,2-不对称诱导。天然产物的特征性1,4-二醇基序通过烯丙基亚砜的[2,3]σ重排或炔丙基亚砜的Mislow-Evans-Braverman重排引入,随后立体选择性还原随后的α,β引入-不饱和酮。与早期报道不同,C11 / C9甲醇中心具有出色的立体控制效果,可以轻松获得C14 / C12不同的天然产物的衍生物。催化不对称方案和底物控制的不对称诱导被用于有效引入立体异构中心。