Photochemistry of benzisothiazoles in the presence of dimethyl acetylenedicarboxylate

✍ Scribed by M. Sindler-Kulyk; D.G. Neckers

• Book ID: 104241376
• Publisher: Elsevier Science
• Year: 1981
• Tongue: French
• Weight: 220 KB
• Volume: 22
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)90145-5

✦ Synopsis

SuMnsry: 1,2-Benzisothiazole gave upon irradiation in the presence of dimethy acetylenedicsrboxylate a mixture of cis-and trans-substituted phenylthioalkenes (II) and Gyano-2,3-dicarboxybenzothiophene.

Some years ago we reported that photx~ycloaddition reactions of alkynes and the heterocycles, benzo(b)thiophene, benzo(b)fWan gave rearran@;ed cyclobutenes (1) as the principle products. Indole arid some of its analogs 5-7 , gave the same [2+2] TI cycloaddition of the triplet