One-Pot Three-Component Synthesis of 2-(1,2,3,4-Tetrahydroisoquinolin-1-yl) oxazoles via DEAD-Promoted Oxidative Ugi/Wittig Reaction

A new efficient DEAD-promoted oxidative Ugi/Wittig reaction for the preparation of 2-(1,2,3,4-tetrahydroisoquinolin-1-yl)oxazoles has been developed. The one-pot reactions of odorless isocyano(triphenylphosphoranylidene)acetates, carboxylic acids, and N-aryl-1,2,3,4-tetrahydroisoquinolines produced polysubstituted 2-(1,2,3,4-tetrahydroisoquinolin-1-yl)oxazoles directly in good yields in the presence of DEAD oxidant.