Brønsted base-catalyzed three-component coupling reaction of α-ketoesters, imines, and diethyl phosphite utilizing [1,2]-phospha-Brook rearrangement
作者:Azusa Kondoh、Masahiro Terada
DOI:10.1039/c6ob00739b
日期:——
α-ketoesters, imines, and diethyl phosphite under Brønsted base catalysis was developed by utilizing the [1,2]-phospha-Brook rearrangement. The reaction involves the generation of ester enolates via the umpolung process, i.e., the chemoselective addition of diethyl phosphite to α-ketoesters followed by the [1,2]-phospha-Brook rearrangement, and the trapping of the resulting enolates by imines preferentially
利用[1,2]-磷-布鲁克重排反应,在布朗斯台德碱催化下,开发了α-酮酸酯,亚胺和亚磷酸二乙酯的三组分偶联反应。该反应涉及通过聚对苯二酚过程产生酯烯酸酯,即,将亚磷酸二乙酯化学选择性加成到α-酮酸酯上,然后进行[1,2]-磷-布鲁克重排,以及亚胺比α-酮酸酯和质子优先捕获亚油酸酯。该操作简单的反应可以以高收率提供在α-位具有氧官能度的致密官能化的β-氨基酸衍生物。非对映选择性很大程度上取决于底物和反应温度,这归因于酯烯酸酯向亚胺的添加的可逆性。该方法进一步扩展到α-酮酸酯,β-硝基苯乙烯和亚磷酸二乙酯的反应。