Synthesis of enantiomerically pure, partly saturated (RS)-[(1S)-isoborneol-10-sulfinyl]-substituted [1,2,4]triazolo[1,2-a]pyridazine, cinnolines and benzo[f]cinnolines

Abstract

The facile Diels-Alder cycloaddition reactions of four enantiopure (R S )-[(1S)-isoborneol-10-sulfinyl]-substituted dienes 1a-d with 4-phenyl-1,2,4-triazoline-3,5-dione (2)