Tricycle 6, containing the CD ring of taxol, is constructed from (S)-(+)-carvone in 21 steps involving a Diels–Alder reaction with isoprene, a Baeyer–Villiger oxidation, an Oppenaurer oxidation and Meerwein–Ponndorf–Verley reduction, a stereospecific Grignard addition, and an intramolecular SN2 reaction as the key steps.
含有
紫杉醇CD环的三轮车6由(S)-(+)-
香芹酮分21步构建,涉及Diels-Alder与
异戊二烯的反应,Baeyer-Villiger氧化,Oppenaurer氧化和Meerwein-Ponndorf-Verley还原,立体定向
格氏试剂加成和分子内S N 2反应是关键步骤。