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Photocycloaddition Reactions of 3-Phenyl-1, 2-benzisothiazole and Alkynes

Photocycloaddition reactions of 3-phenyl-1, 2-benzisothiazole (1) and the electron-rich alkynes ethoxyacetylene (2a), ethoxypropyne (2b), and (diethylamino)propyne (2c) gave substituted 3, 4-benzo-2, 6-thiazabicyclo[3.2.0]-hepta-3, 6-dienes (3a, 3b, 6) in one-step processes presumably via the 1, 4-benzothiazepines 13 and 14.

photocycloadditon ; thiazabicyclo[3.2.0]heptadiene ; benzothiophene ; ethoxyacetilene

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