Highly Stereoselective Palladium Catalysed Cross-Coupling Approaches to the Total Synthesis of Phthoxazolin A
作者:Nadine Hénaff、Andrew Whiting
DOI:10.1016/s0040-4020(00)00182-4
日期:2000.7
The first total synthesis of racemic Phthoxazolin A 4 is described, involving a convergent series of palladium cross-coupling reactions to stereoselectively construct the Z,Z,E-trienyl unit. The most important steps involve using vinylboronate pinacol ester 1 as a vinyl dianion equivalent, by employing a Heck coupling of a vinyl iodide 9 with the vinyl boronate 1, followed by a deboronation–iodination
描述了外消旋邻苯二恶唑啉A 4的第一个全合成,涉及一系列收敛的钯交叉偶联反应,以立体选择性地构建Z,Z,E-三烯基单元。最重要的步骤包括使用乙烯基碘化物9与乙烯基硼酸酯1进行Heck偶联,将乙烯基硼酸酯频哪醇酯1用作乙烯基二价阴离子,然后进行脱硼-碘化顺序以及烯烃立体化学的反转,以提供新的烯基碘化物6。乙烯基碘化物6与恶唑基烯基锡烷40的最终Stille偶联提供了甲唑啉A 4。