A Fresh Look at the Staudinger Reaction on Azido Esters: Formation of 2<i>H</i>-1,2,3-Triazol-4-ols from α-Azido Esters Using Trialkyl Phosphines
作者:Scott D. Taylor、Chuda Raj Lohani
DOI:10.1021/acs.orglett.6b02204
日期:2016.9.2
Phenyl esters of α-azido acids react with trialkylphosphines in THF/H2O to give 5-substituted 2H-1,2,3-triazol-4-ols in good to excellent yields. In contrast, their reaction with PPh3 in THF/H2O give the amino esters as the major product and no triazoles. Reaction between an α-azido phenyl ester and P(OEt)3 provided the corresponding phosphoramidate in excellent yield, but no triazole was formed.
α-叠氮酸的苯基酯与三烷基膦在THF / H 2 O中反应,以良好或极好的收率得到5取代的2 H -1,2,3-三唑-4醇。相反,它们与PPh 3在THF / H 2 O中的反应给出氨基酯作为主要产物,而没有三唑。α-叠氮基苯基酯与P(OEt)3之间的反应以优异的产率提供了相应的氨基磷酸酯,但是没有形成三唑。