New dihydrophenanthrapyrans from cedrelinga catenaeformis
摘要:
Two new dihydrophenanthrapyrans 1 and 2 have been isolated from Cedrelinga catenaeformis Duke (Leguminoseae), and their structures and absolute configurations have been determined by NMR and CD spectroscopy; chemical correlation of them with paralycolin A, which had been obtained from Clusia paralycola, has led to revision of the structure of the latter compound.