A common intermediate providing syntheses of .PSI.-tabersonine, coronaridine, iboxyphylline, ibophyllidine, vinamidine, and vinblastine
摘要:
Generation of the key tetracyclic intermediates 14a,b in six steps (42% overall) and subsequent short reduction, oxidation, and arylation sequences results in total syntheses of the title compounds 8, 9, 10, 11, 12, and 13.
Enantioselective syntheses of coronaridine and 18-methoxycoronaridine
作者:Martin E Kuehne、Timothy E Wilson、Upul K Bandarage、Wenning Dai、Qian Yu
DOI:10.1016/s0040-4020(01)00045-x
日期:2001.3
gave diastereoselectively, through a secodine-type intramolecularDiels–Alderreaction, tetracyclicintermediates that could be carried to (−)-coronaridine or to the important anti-addictive (−)-18-methoxycoronaridine. The 2,3-(R)-ferroceno-6,6-dimethyl-1-(S)-cyclohexyl chiral auxiliary was most effective, providing >99% ee of a tetracyclicintermediate after removal of the chiral auxiliary group.