Palladium(II)-Catalyzed Highly Stereoselective Sandwich-Type Triple Cyclization Reaction of 1,5-Bisallenes and 2,3-Allenoic Acids
作者:Xiongdong Lian、Shengming Ma
DOI:10.1002/chem.201000992
日期:2010.7.19
Triple‐decker sandwich: A sandwich‐type triple cyclization of two molecules of 2,3‐allenoic acid and one molecule of 1,5‐bisallene in the presence of a palladium catalyst with excellent stereoselectivity has been developed. The diallyl‐substituted cis products may easily be transformed to fused tetracyclic compounds with a 12‐membered ring (see scheme). Based on the result of optically active 2,3‐allenoic
三层三明治:在钯催化剂存在下,具有优异的立体选择性的两分子2,3-烯丙酸和一个分子1,5-双烯丙基的三明治型三环化反应已得到开发。二烯丙基取代的顺式产物很容易转化为带有12元环的稠合四环化合物(参见方案)。根据旋光性2,3-烯丙酸的结果,提出了可能的催化循环。