Oxidative rearrangement of pentaalkoxychalcones with phenyliodine(III) bis(trifluoroacetate) (PIFA): synthesis of (±)-10-bromopterocarpin and (±)-pterocarpin
作者:Yasuyoshi Miki、Rie Fujita、Ko-ichi Matsushita
DOI:10.1039/a803561j
日期:——
The oxidative rearrangement of pentaalkoxychalcones using the hypervalent iodine compound, phenyliodine(III) bis(trifluoroacetate) (PIFA), has been examined. Treatment of 2,2′-bis(benzyloxy)-4′-methoxy-4,5-methylenedioxychalcone with PIFA gives a rearrangement product in low yield, but 2,2′-bis(benzyloxy)-3-bromo-4′-methoxy-4,5-methylenedioxychalcone yields the rearrangement product, which leads to (±)-bromopterocarpin and (±)-pterocarpin.
使用高价碘化合物苯碘(III)双(三氟乙酸酯)(PIFA)对五烷氧基查耳酮的氧化重排进行了研究。用 PIFA 处理 2,2'-双(苄氧基)-4'-甲氧基-4,5-亚甲二氧基查尔酮,得到低产率的重排产物,但 2,2'-双(苄氧基)-3-溴-4'-甲氧基-4,5-亚甲二氧基查尔酮产生重排产物,产生(±)-溴紫檀素和(±)-紫檀素。