Enantioselective Total Synthesis and Absolute Configuration of the Natural Norsesquiterpene 7-Demethyl-2-methoxycalamenene by a Silane-Terminated Intramolecular Heck Reaction
作者:Lutz F. Tietze、Thomas Raschke
DOI:10.1002/jlac.199619961207
日期:1996.12
The total synthesis of the norsesquiterpene 7-demethyl-2-methoxycalamenene (1) by a newly developed enantioselective silane-terminated Heck reaction is described. The Pd0-catalyzed transformation of the allylsilane 7, obtained from 3-(3-methoxyphenyl)propanol (2) in 7 steps, provides the tetralin 8 in 91% yield and with 92% ee in the presence of (R)-BINAP. Transformation of 8via14and15 gives 1. The
描述了通过新开发的对映选择性硅烷封端的Heck反应的去甲倍半萜7-脱甲基-2-甲氧基cal烯(1)的全合成。从3-(3-甲氧基苯基)丙醇(2)中分7步获得的烯丙基硅烷7的Pd 0催化转化,在(R)-BINAP存在下以91%的收率和92%ee的浓度提供了四氢化萘8。。通过14和15将8转换为1。从10的单晶X射线分析推论出先前未知的1的绝对构型通过环硼化和用樟脑酰氯酰化从环化产物8中获得的α,β。