In situ intramolecular catalytic 1,2-addition of allenoates to cyclic ketones towards polycyclic allenoates
作者:Clément F. Heinrich、Michel Miesch、Laurence Miesch
DOI:10.1039/c4ob02451f
日期:——
Sequential deprotonation, isomerization of 3-alkynoates and subsequent 1,2-addition led to bicyclic allenoate in the presence of a catalytic amount of Cs2CO3. Cyclization proceeds in a totally stereoselective manner in the case of the two-carbon linker chain. A one-pot reaction starting from alkynyl ketones afforded tricyclic fused ring systems with good yields.
在催化量的Cs 2 CO 3存在下,连续的去质子化,3-链烷酸酯的异构化以及随后的1,2-加成导致双环烯丙酸酯。在二碳连接子链的情况下,环化以完全立体选择性的方式进行。从炔基酮开始的一锅反应得到具有良好收率的三环稠合环系统。