Highly efficient and stereoselective route to threo- and erythro-α-allylated α-fluoro-β-hydroxy esters via radical allylation reaction
作者:Takashi Ishihara、Kazuhide Mima、Tsutomu Konno、Hiroki Yamanaka
DOI:10.1016/s0040-4039(02)00608-1
日期:2002.5
Treatment of α-bromo-α-fluoro-β-hydroxy esters with trimethylaluminum in dichloromethane, followed by reaction with allylic stannanes and a catalytic amount of triethylborane at −15°C, gave the corresponding threo-α-allylated α-fluoro-β-hydroxy esters in a highly stereoselective manner. On the other hand, the reaction of the β-hydroxy esters with allylic stannanes under the influence of a catalytic
在二氯甲烷中用三甲基铝处理α-溴-α-氟-β-羟基酯,然后与烯丙基锡烷和催化量的三乙基硼烷在-15°C下反应,得到相应的苏-α-烯丙基化的α-氟-β -羟基酯以高度立体选择性的方式。在另一方面,在四氢呋喃或异丙醇三乙基硼烷的催化量的影响下烯丙基锡烷的β羟基酯在-78℃下反应进行赤型-选择性,优选导致赤相应的异构体α-烯丙基化的酯。