Intramolecular Diels–Alder reaction leading to tricyclic derivatives as intermediates of natural products synthesis
作者:Junichi Shiina、Shigeru Nishiyama
DOI:10.1016/s0040-4020(03)01013-5
日期:2003.8
Tricyclic compounds 4a and 4b possessing a bicyclo[4.3.0] moiety, were successfully synthesized by using the intramolecular Diels–Alder reaction. The siloxy- rather than acyloxy-substituents increased the ratio of the endo-cylcoadducts 10 and 12. The oxygen substitution of 9 influenced conformation of the transition state, which was stereochemically restricted by the butenolide moiety. In addition