Synthesis and Diels-Alder reactions of N-methylthionomaleimide
摘要:
N-Methylthionomaleimide (6) has been synthesized. It is the first example of a thionomaleimide unsubstituted on the olefinic C atoms. Its dienophilic behavior at the olefinic center, with representative dienes (symmetrical and unsymmetrical), has been investigated. There is appreciable regioselectivity with terminally oxygenated unsymmetricaI dienes, the O-substituted carbon of the diene adding preferentially to the thiono-substituted end of the olefin.