A highly selective synthesis of 1-substituted (<i>E</i>)-buta-1,3-dienes with 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane as building block
作者:Justyna Szudkowska-Frątczak、Aline Ryba、Adrian Franczyk、Jędrzej Walkowiak、Maciej Kubicki、Piotr Pawluć
DOI:10.1002/aoc.3095
日期:2014.3
selective synthesis of 1‐substituted (E)‐buta‐1,3‐dienes via palladium‐catalyzed Suzuki–Miyaura cross‐coupling of (E)‐alkenyl iodides with 4,4,5,5‐tetramethyl‐2‐vinyl‐1,3,2‐dioxaborolane (1) is reported. The vinylboronate pinacol ester (1) acts as a vinyl building block to show high chemoselectivity for the Suzuki–Miyaura pathway versus Heck coupling in the presence of biphasic conditions (Pd(PPh3)4, aqueous
1 -取代的(的高选择性合成ë)通过钯催化的铃木-宫浦交叉偶联-丁-1,3-二烯(É) -烯基碘化物与4,4,5,5-四甲基-2-乙烯基-据报道有1,3,2-二氧杂硼烷(1)。在双相条件下(Pd(PPh 3)4,K 2 CO 3水溶液,甲苯和乙醇),乙烯基硼酸酯频哪醇酯(1)作为乙烯基结构单元显示出对Suzuki-Miyaura途径的高化学选择性与Heck偶合。版权所有©2014 John Wiley&Sons,Ltd.