使用铱催化的不对称氢化反应制备了几种手性磺酰基化合物。研究了乙烯基、烯丙基和高烯丙基砜的取代,无论烯烃相对于砜的位置如何,都保持了高对映选择性。二烷基取代获得了令人印象深刻的立体选择性,这通常是氢化中具有挑战性的底物。正如预期的那样,体积更大的 Z 底物比相应的 E 异构体氢化得更慢,并且对映选择性略低。
The contra-thermodynamic isomerization of α- and β-substituted cinnamate derivatives catalyzed by the Cu(OAc)2/rac-BINAP complex under blue light irradiation is reported. The use of an oxazolidinone template, which favored the complexation of the copper catalyst to the substrate, allowed the E → Z isomerization of the catalytically formed chromophore under simple and robust reaction conditions in good