Synthesis of optically active butenolides via chromium alkoxycarbene complexes: total synthesis of (+)-tetrahydrocerulenin and two butenolides from the marine sponge Plakortis lita
摘要:
Optically active butenolides were synthesized from the corresponding cyclobutanones, derived from the photolysis of chromium alkoxycarbene complexes and optically active ene-carbamates. The cyclobutanones were oxidized (Baeyer-Villiger) to the corresponding lactones, and subsequent base-induced elimination of the beta-oxazolidinone ring provided optically active butenolides efficiently. The butenolides were utilized in the syntheses of (+)-tetrahydrocerulenin and two marine natural products.
Synthesis of optically active butenolides via chromium alkoxycarbene complexes: total synthesis of (+)-tetrahydrocerulenin and two butenolides from the marine sponge Plakortis lita
摘要:
Optically active butenolides were synthesized from the corresponding cyclobutanones, derived from the photolysis of chromium alkoxycarbene complexes and optically active ene-carbamates. The cyclobutanones were oxidized (Baeyer-Villiger) to the corresponding lactones, and subsequent base-induced elimination of the beta-oxazolidinone ring provided optically active butenolides efficiently. The butenolides were utilized in the syntheses of (+)-tetrahydrocerulenin and two marine natural products.