Diels-Alder reaction of R-(−)-carvone with isoprene
作者:Tony K.M. Shing、Ho Y. Lo、Thomas C.W. Mak
DOI:10.1016/s0040-4020(99)00145-3
日期:1999.4
Diels-Alderreactions of R-(−)-carvone with isoprene using different Lewis acids as catalysts have been studied. The best results were obtained with EtAlCl2 at 25°C for 48 hours. The yields are quantitative and the d.e. is 86.8%. Regioselective dihydroxylation at the endocyclic double bond of the cycloadduct followed by acetonation gave a crystalline acetonide, the structure and stereochemistry of