Concerning the diastereofacial selectivity of the reaction of (E)-β-nitroenones with ketone enolates
作者:Mohammed Ahrach、Raphaël Schneider、Philippe Gérardin、Bernard Loubinoux
DOI:10.1016/s0040-4020(98)00972-7
日期:1998.12
Stereoselectivity of the reaction of acyclic ketone enolates with (E)-β-nitroenones was investigated according to the nature of the base used to accomplish deprotonation. The stereoselectivity and the regioselectivity of the reaction of ketone enolates with (E)-β-nitroenones could be enhanced by the use of trichlorotitanium enolates, which allowed the formation of diastereomeric mixture of (E)-3-h
根据用于完成去质子化的碱的性质,研究了无环酮烯酸酯与(E)-β-硝基烯酮的反应的立体选择性。通过使用三氯钛烯醇酸酯可以增强酮烯醇酸酯与(E)-β-硝基烯酮反应的立体选择性和区域选择性,这允许形成(E)-3-羟基-5-硝基alk-4的非对映异构体混合物-烯醇3,其中(l)构型的产物的量与烯醇锂得到的结果相比增加。