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.