Chemoselective synthesis of tetrasubstituted furans via intramolecular Wittig reactions: mechanism and theoretical analysis
作者:Yu-Ting Lee、Yen-Te Lee、Chia-Jui Lee、Chia-Ning Sheu、Bo-Yu Lin、Jeng-Han Wang、Wenwei Lin
DOI:10.1039/c3ob40858b
日期:——
An efficient synthesis of tetrasubstituted furans was achieved from the corresponding α,β-unsaturated ketone derivatives, acid chlorides, and Bu3P in the presence of Et3N via a chemoselective intramolecular Wittig reaction as the key step. The presence of an additional electron-withdrawing group in the α-position of Michael acceptors controlled the chemoselectivities of presumable phosphorus ylides
在Et 3 N存在下,通过化学选择性分子内Wittig反应,由相应的α,β-不饱和酮衍生物,酰氯和Bu 3 P有效合成了四取代呋喃,这是关键步骤。Michael受体的α位上存在一个额外的吸电子基团,控制着分子内Wittig反应中可推测的磷化氢的化学选择性,并通过DFT计算研究了它们的机理。