[EN] IMPROVED PROCESS FOR PREPARING 2-[(2E)-2-FLUORO-2-(3-PIPERIDINYLIDENE)ETHYL]-1H-ISOINDOLE-1,3(2H)-DIONE [FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE 2-[(2E)-2-FLUORO-2- (3-PIPÉRIDINYLIDÈNE)ÉTHYL]-1H-ISOINDOLE-1,3(2H)-DIONE
C16H20FNO2 在
chiralPak AD 作用下,
以4.16 g的产率得到ethyl 2-(1-benzylpiperidin-3-ylidene)-2-fluoroacetate
参考文献:
名称:
[EN] IMPROVED PROCESS FOR PREPARING 2-[(2E)-2-FLUORO-2-(3-PIPERIDINYLIDENE)ETHYL]-1H-ISOINDOLE-1,3(2H)-DIONE [FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE 2-[(2E)-2-FLUORO-2- (3-PIPÉRIDINYLIDÈNE)ÉTHYL]-1H-ISOINDOLE-1,3(2H)-DIONE
Origin of the <i>E</i>/<i>Z</i> Selectivity in the Synthesis of Tetrasubstituted Olefins by Wittig Reaction of α-Fluorophosphonium Ylides: An Explanation for the Low Stereoselectivity Observed in Reactions of α-Alkoxy Aldehydes
作者:Dominique Depré、Wim A. A. Vermeulen、Yolande Lang、Jean Dubois、Jan Vandevivere、Jeremy Vandermeersch、Longchuan Huang、Raphaël Robiette
DOI:10.1021/acs.orglett.7b00344
日期:2017.3.17
96/4) by Wittig reactionbetween α-heterosubstituted ketones and α-fluorophosphonium ylides. A detailed study of factors that control stereoselectivity in these reactions shows that stereoselectivity is the result of stabilizing CH···F and N···C═O interactions in the addition TS leading to the E isomer. This analysis provides a rationale for the observed decrease in selectivity for reactions of stabilized