Stereoselective ozonolysis of TMS-substituted allylic alcohol derivatives and synthesis of 14<i>R</i>,15<i>S</i>- and 14<i>S</i>,15<i>S</i>-diHETE
作者:Shun Saito、Takashi Yamazaki、Yuichi Kobayashi
DOI:10.1039/c8ob02116c
日期:——
contrast, Z-olefins selectively gave the syn isomers with syn/anti ratios of 4–19 : 1. Facial selection was speculated based on the Cieplak effect. This ozonolysis was successfully applied for the synthesis of 14R,15S- and 14S,15S-diHETEs (anti and syn isomers, respectively) in enantioenriched forms.
TMS取代的烯烃的臭氧分解可产生α-羰基TMS过氧化物,而不会裂解C C键。在此,使用(E)-和(Z)-(1-TMS)alk-1-en-3-ols的甲硅烷基衍生物研究了臭氧分解中的立体化学。(E)异构体经Ph 3 P还原后,提供了主要的立体异构体(抗/ syn = 3–9:1),为抗-3-甲硅烷氧基-2-(TMS-氧基)醛。Z-烯烃选择性生成具有syn / anti的顺式异构体。比例为4:19:1。根据Cieplak效应推测了面部选择。此臭氧分解被成功地应用于14的合成- [R,15小号-和14小号,15小号(-diHETEs抗和顺式在对映体富集形式的分别的异构体,)。