First diastereoselective [3 + 2] cycloaddition reaction of diethyl isocyanomethylphosphonate and maleimides
作者:Carlos Arróniz、Juan Molina、Sonia Abás、Elies Molins、Josep M. Campanera、F. Javier Luque、Carmen Escolano
DOI:10.1039/c3ob26766k
日期:——
Bicyclic α-iminophosphonates were prepared via the first diastereoselective silver catalyzed [3 + 2] cycloaddition reaction of diethyl isocyanomethylphosphonate and diversely N-substituted maleimides. The reduction of the resulting imine by catalytic hydrogenation led to cyclic α-aminophosphonates, which are α-aminoester surrogates. The relative stereochemistry of the adducts was confirmed by X-ray