The treatment of tributyltin hydride with α-substituted propenoyl oxazolidinones in the presence of a catalytic amount of AIBN gave the tributyltin radical addition adduct when the substituent is an alkyl group. However, when the substituent is an aryl group, the reduction adduct was obtained in modest diastereoselectivity. The yield of this reduction process was improved by using Pd(PPh3)4 as a catalyst. The application of this stereoselective hydrogenation reaction to the synthesis of α-alkyl arylacetic acids is described.
在一定量的 AIBN 催化下,三丁基氢化
锡与δ-取代的
丙烯酰
噁唑烷酮进行处理,当取代基为烷基时,可得到三
丁基锡自由基加成加合物。然而,当取代基为芳基时,还原加合物的非对映选择性较低。使用 Pd(PPh3)4 作为催化剂可以提高还原过程的产率。本文介绍了这种立体选择性氢化反应在合成δ-烷基芳基
乙酸中的应用。