Self-condensation of aromatic aldehydes with trimethylsilyl cyanide proceeded by the cooperative catalytic effect of VO(OiPr)3 and a Lewis base to give the corresponding O-acylated cyanohydrins. The reaction conversion and selectivity were strongly dependent on the solvent used, the Lewis base, and the presence of oxygen. All the nine kinds of aromatic aldehydes considered herein afforded the O-acylated cyanohydrins with excellent selectivity under an O2 atmosphere.
芳香醛与三甲基
硅基
氰的自缩合反应在VO(OiPr)3和路易斯碱的协同催化作用下进行,生成相应的O-酰基化
氰醇。反应的转化率和选择性强烈依赖于所使用的溶剂、路易斯碱以及
氧气的存在。本文考虑的九种芳香醛在
氧气氛围下均以优异的选择性生成了O-酰基化
氰醇。