Use of boron enolates in water. The first boron enolate-mediated diastereoselective aldol reactions using catalytic boron sources
作者:Yuichiro Mori、Juta Kobayashi、Kei Manabe、Shū Kobayashi
DOI:10.1016/s0040-4020(02)00976-6
日期:2002.10
aldol reactions in water using a catalytic amount of diarylborinic acid have been developed. The reactions proceeded smoothly in the presence of a small amount of an anionic surfactant and a Brønsted acid. Water was the most suitable solvent, and organic solvents such as ether and dichloromethane were ineffective in this system. Use of bis(4-trifluoromethylphenyl)borinic acid gave high catalytic activity
已经开发了使用催化量的二芳基硼酸在水中的高度非对映选择性的醛醇缩合反应。在少量阴离子表面活性剂和布朗斯台德酸的存在下,反应平稳进行。水是最合适的溶剂,而有机溶剂(例如乙醚和二氯甲烷)在该系统中无效。使用双(4-三氟甲基苯基)硼酸具有高催化活性。最合理的结论是,反应的活性种类是烯醇硼,这是在烯醇硼介导的非对映选择性醛醇缩合反应中催化使用硼源的第一个例子。