A highly efficient asymmetric inverse-electron-demand oxa-Diels–Alder reaction of o-quinone methides with fulvenes has been realized using a chiral N,N′-dioxide/Sc(III) complex as the catalyst. The corresponding optically active chromane derivatives were obtained in high yields with excellent dr and ee values (up to 99% yield, >19 : 1 dr and 94% ee).
A Practical and General Diels–Alder Reaction of Pentafulvenes with Arynes
作者:Sachin Suresh Bhojgude、Trinadh Kaicharla、Anup Bhunia、Akkattu T. Biju
DOI:10.1021/ol301742k
日期:2012.8.17
A high-yielding, versatile and practical Diels-Alder reaction of pentafulvenes with arynes under mild reaction conditions is reported. The aryne generated by the fluoride induced 1,2-elimination of 2-(trimethylsilyl)aryl triflates undergoes efficient cycloaddition with 6-substituted and 6,6-disubstituted pentafulvenes leading to the formation of benzonorbornadiene derivatives.