Electrochemically Enabled Carbohydroxylation of Alkenes with H2O and Organotrifluoroborates
摘要:
Unprecedented hydroxy-alkynylation and -alkenylation reactions of arylalkenes have been developed through electrochemically enabled addition of an organotrifluoroborate reagent and H2O across the double bond of the alkene. The use of electrochemistry to promote these oxidative alkene 1,2-difunctionalization reactions not only obviates the need for transition-metal catalysts and oxidizing reagents but also ensures high regio- and chemoselectivity to afford homopropargylic or homoallylic alcohols. The possibility of extending the electro-chemical alkene difunctionalization strategy to other alkene carbo-heterofunctionalization reactions has been demonstrated.
Electrochemically Enabled Carbohydroxylation of Alkenes with H2O and Organotrifluoroborates
摘要:
Unprecedented hydroxy-alkynylation and -alkenylation reactions of arylalkenes have been developed through electrochemically enabled addition of an organotrifluoroborate reagent and H2O across the double bond of the alkene. The use of electrochemistry to promote these oxidative alkene 1,2-difunctionalization reactions not only obviates the need for transition-metal catalysts and oxidizing reagents but also ensures high regio- and chemoselectivity to afford homopropargylic or homoallylic alcohols. The possibility of extending the electro-chemical alkene difunctionalization strategy to other alkene carbo-heterofunctionalization reactions has been demonstrated.
Reaction of dialkylzincs with lithiated acetylenic epoxides is described to give zincates that undergo a 1,2-metallate rearrangement by an anti-SN2′ pathway. This rearrangement occurs with the transfer of an alkyl or a silyl group affording allenylzinc intermediates. Allenic and/or homopropargylic alcohols are obtained upon hydrolysis. Quenching the reaction mixture with aldehydes or ketones is shown
描述了二烷基锌与锂化的炔属环氧化物的反应以通过反-S N 2'途径产生经历1,2-金属盐重排的锌酸盐。这种重排通过烷基或甲硅烷基的转移发生而得到烯丙基锌中间体。烯丙和/或均丙醇在水解时获得。显示用醛或酮淬灭反应混合物以立体选择性方式获得2-炔基-1,3-二醇。
Electrochemically Enabled Carbohydroxylation of Alkenes with H<sub>2</sub>O and Organotrifluoroborates
Unprecedented hydroxy-alkynylation and -alkenylation reactions of arylalkenes have been developed through electrochemically enabled addition of an organotrifluoroborate reagent and H2O across the double bond of the alkene. The use of electrochemistry to promote these oxidative alkene 1,2-difunctionalization reactions not only obviates the need for transition-metal catalysts and oxidizing reagents but also ensures high regio- and chemoselectivity to afford homopropargylic or homoallylic alcohols. The possibility of extending the electro-chemical alkene difunctionalization strategy to other alkene carbo-heterofunctionalization reactions has been demonstrated.