New and efficient approaches to the semisynthesis of taxol and its C-13 side chain analogs by means of β-lactam synthon method
作者:Iwao Ojima、Ivan Habus、Mangzhu Zhao、Martine Zucco、Young Hoon Park、Chung Ming Sun、Thierry Brigaud
DOI:10.1016/s0040-4020(01)91210-4
日期:1992.1
Highly efficient chiral ester enolate-imine condensation giving 3-hydroxy-4-aryl-β-lactams with excellent enantiomeric purity is successfully applied to the asymmetric synthesis of the enantiomerically pure taxol C-13 side chain, N-benzoyl-(2R,3S)-3-phenyl-isoserine and its analogs. (3R,4S)-N-benzoyl-3-(1-ethoxyethoxy)-4-phenyl-2-azetidinone readily derived from the 3-hydroxy-4-phenyl-β-lactam is coupled
高效手性酯烯酸酯-亚胺缩合可产生具有优异对映体纯度的3-羟基-4-芳基-β-内酰胺,已成功用于对映体纯紫杉醇C-13侧链N-苯甲酰基-(2 R, 3 S)-3-苯基-异丝氨酸及其类似物。易于衍生自3-羟基-4-苯基-β-内酰胺的(3 R,4 S)-N-苯甲酰基-3-(1-乙氧基乙氧基)-4-苯基-2-氮杂环丁酮与受保护的浆果赤霉素III偶联,然后通过脱保护得到光学纯的紫杉醇和高产率的10-脱乙酰基7,10-双(Troc)-紫杉醇。完全分配的1 H,13显示并讨论了由此合成的紫杉醇的C和2D(COSY和HETCOR)NMR光谱。