Taxol-type compounds are produced by coupling baccatin III-type compounds (and related alcohols) with chemoenzymatically produced β-lactam enantiomers. The β-lactam enantiomers are produced from racemic starting substituted β-lactams through lipase contacting to achieve either enantioselective hydrolysis or enantioselective transesterification (the latter with an added 1-substituted ethenyl acetate). Preferred β-lactam enantiomers are coupled to the C-13 hydroxyl of the starting baccatin III-type compounds which are derived from 10-deacetyl baccatin III. Certain of the β-lactam enantiomers are new as are taxol-type compounds produced by the coupling reaction.
紫杉
醇类似化合物是通过将
紫杉醇Ⅲ型化合物(及相关
醇类)与
化学酶法产生的β-内酰胺对映体偶联而产生的。β-内酰胺对映体是通过
脂肪酶接触来自手性起始取代β-内酰胺的光学异构体,以实现择优
水解或选择性转酯化(后者加入了1-取代
乙烯酸
乙酯)。优选的β-内酰胺对映体与起始
紫杉醇Ⅲ型化合物的C-13羟基耦合,后者是从10-去乙酰
紫杉醇Ⅲ型化合物中得到的。某些β-内酰胺对映体是新的,由耦合反应产生的紫杉
醇类似化合物也是新的。