Synthesis of Chiral Phosphorus Reagents and Their Application in Combination With Lewis Acid as a Cocatalyst in Morita–Baylis–Hillman Reaction
作者:Hongying Tang、Xiamin Cheng、Zhongbiao Zhang
DOI:10.1080/10426507.2011.568024
日期:2012.1.1
Two novel chiral thiophosphoramides and two chiral phosphoramidites were synthesized starting from (S)-α-phenylethylamine and (R)-(+) or (S)-(−)-1,1′-Bi-2-naphthol (BINOL), respectively, and their application in combination with Lewis acid as cocatalysts in asymmetric Morita–Baylis–Hillman (MBH) reaction was investigated. Dramatic rate acceleration (the corresponding adducts were obtained in fair to excellent
摘要 以 (S)-α-苯乙胺和 (R)-(+) 或 (S)-(-)-1,1'-Bi-2-萘酚 (BINOL) 为原料合成了两种新型手性硫代磷酰胺和两种手性亚磷酰胺,分别研究了它们与路易斯酸作为助催化剂在不对称 Morita-Baylis-Hillman (MBH) 反应中的应用。在这些手性磷试剂/路易斯酸共催化的 4-硝基苯甲醛和活化烯烃之间的 MBH 反应中观察到显着的速率加速(相应的加合物在 15 分钟到 5 小时内以相当到极好的化学产率获得),并且在一种情况下,对映选择性适中达到了(相应的加合物的 ee 值为 44%)。图形概要