Studies on diels-alder reactions of 1,3,3-trimethyl-2-vinylcyclohexene with 2-cyclohexenones
作者:Thomas A. Engler、UmaShanker Sampath、David Vander Velde、Fusao Takusagawa
DOI:10.1016/s0040-4020(01)88309-5
日期:1992.1
The ZnBr2-catalyzed reaction of 1,3,3-trimethyl-2-vinylcyclohexene (4) with 2-carbomethoxy-4,4-dimethyl-2-cyclohexenone at high pressure (12 kbar) produces the expected Diels-Alder product. However, reactions of (4) with the more sterically demanding dienophile (5a) give products of apparent Michael reaction followed by proton transfer.