Add time:07/19/2019         Source:sciencedirect.com

4H-1-Benzopyran-4--thio)ie (1) reacted smoothly with nitrilimines (3a-e) to afford regioselectiue cycloadducts (4a-X) in good yields. In contrast, benzonitrile oxide (6) and aldonitrones (7a-d) reacted preferentially at the thione function. The unstable cycloadduct (B) or (9) ruptured to give as isolable products chromone (10) and phenyl isothiocyanate (11) and the tnioamides (12a-d). This indirectly proves the site of attack of the dipole at the thione group.

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