The transformation proceeds with high yield (up to 99 %) and stereoselectivity (up to 97:3 e.r.) using water as solvent under mild conditions. The catalyst system provides a new strategy for the synthesis of optically active benzyl mercaptans. Control experiments suggested that o‐QMs are generated by the tertiary amine moiety of the squaramide organocatalyst and that the water–oil biphase is crucial
三苯甲基
硫醇对映选择性共轭加成到原位生成的邻醌甲基化物(o- QMs)中,是由酸碱双功能方酰胺有机催化剂催化的。使用
水作为溶剂,在温和的条件下,转化率高(达99%)和立体选择性(达97:3 er)。该催化剂体系为合成光学活性的
苄硫醇提供了新的策略。对照实验表明,邻-QM是由方酰胺有机催化剂的叔胺部分生成的,
水-油双相对于实现高反应活性和立体选择性至关重要。