Facile Synthesis of (−)-Ascochlorin Using Palladium-catalyzed Three Component Coupling Reaction
作者:Makoto Aoki、Kenji Kawashima、Hirohisa Fujihara、Isao Shimizu
DOI:10.1246/cl.2007.654
日期:2007.5.5
(-)-Ascochlorin was synthesized using palladium-catalyzed three component coupling reaction. Reaction of the aryl iodide 3, isoprene, and sodium p-toluenesulfinate in the presence of Pd 2 (dba) 3 CHCl 3 catalyst and NaHCO 3 gave the 4-aryl-2-methyl-2-butenylsulfone 5 selectively in 68% yield. The allylic sulfone 5 was converted into the useful intermediate 2 in 5 steps, which was subjected to Julia
(-)-Ascochlorin 是使用钯催化的三组分偶联反应合成的。在Pd 2 (dba) 3 CHCl 3 催化剂和NaHCO 3 存在下芳基碘化物3、异戊二烯和对甲苯亚磺酸钠的反应以68%的产率选择性地产生4-芳基-2-甲基-2-丁烯基砜5。烯丙基砜 5 在 5 个步骤中转化为有用的中间体 2,将其与醛 4 进行 Julia 烯化并脱保护得到 (-)-子壳二氢四氢卟酚。