New tricyclic annelated cyclobutylcarbinols are synthesized diastereoselectively. Acid-induced fragmentation and Wagner-Meerwein rearrangement of these alcohols to give bicyclic dienes and annelated norbornanes are reported.
A simple and efficient route towards usefully functionalised six and seven-membered ring systems via α-hydroxycyclobutane rearrangement followed by retroaldol cleavage
作者:Brindaban C. Ranu、Dipak C. Sarkar、Manas K. Basu
DOI:10.1016/s0040-4020(01)80137-x
日期:1989.1
Acid-catalysedrearrangement of α-hydroxycyclobutane derivative 10 followed by retroaldol cleavage and oxidation in an one-pot operation furnishes 18-methyl-1α, 4α-cycloheptane dicarboxylic acid 12 in excellent yield. With proper selection of starting α-hydroxycyclobutane derivative this methodology leads to highly functionalised [5-7] and [5-6] fused ring systems 17 and 20 respectively.