Cyclic chlorophosphites as scaffolds for the one-pot synthesis of α-aminophosphonates under solvent-free conditions
作者:K.C. Kumara Swamy、Sudha Kumaraswamy、K. Senthil Kumar、C. Muthiah
DOI:10.1016/j.tetlet.2005.03.080
日期:2005.5
New α-aminophosphonates of the type (OCH2CMe2CH2O)P(O)CH(NHCO2R)(R′) [6a–i, 7a–e, and 8a–c] have been synthesized in high yields by a three-component reaction using (OCH2CMe2CH2O)PCl (3), benzamide (or urethane or benzyl carbamate), and an aldehyde without using any catalyst under solvent-free conditions. This route can be readily adapted for bis-aminophosphonates as well as optically active binaphthoxy
高产合成了(OCH 2 CMe 2 CH 2 O)P(O)CH(NHCO 2 R)(R')[ 6a – i,7a – e和8a – c ]类型的新α-氨基膦酸酯(OCH 2 CMe 2 CH 2 O)PCl(3),苯甲酰胺(或氨基甲酸酯或氨基甲酸苄酯)和醛,在无溶剂条件下不使用任何催化剂。该路线可容易地适用于双氨基膦酸酯以及旋光性双萘氧基α-氨基膦酸酯;如羟基官能化氨基膦酸酯的合成所示,它还可以耐受酚基-OH基团。化合物7a – d的部分水解会导致膦烷环首先断裂的产物。化合物(OCH 2 CMe 2 CH 2 O)P(O)CH [NHC(O)Ph](9-蒽基)(6f)和光学纯的(R,S)-(-)-(C 20 H 12 O 2通过X射线晶体学表征)P(O)CH(NHCO 2 Et)(Ph)(14a)。