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Communication | Regular issue | Vol 24, No. 10, 1986, pp.2749-2752
Published online, 1st January, 1970
DOI: 10.3987/R-1986-10-2749
Photocycloaddition of Diethyl Acetylenedicarboxylate to 2-Phenyl-4H-1,3-benzothiazine Derivatives

Marija Sindler-Kulyk,* Alojz Dumbovic, Dunja Arzic, Biserka Metelko, and Lajosz Fodor

*Organic Chemistry Department, Faculty of Technology, University of Zagreb, Marulicev trg 20, 41000 Zagreb, Croatia

Abstract

Upon irradiation in the presence of diethyl acetylenedicarboxylate 6,7-dimethoxy-2-phenyl-4H-1,3-benzothiazine gives two main products: benzonitrile (X) and 2,3-carbethoxy-4,5-dimethoxy-7-methylbenzothiophene (XI). We report herein the first photochemical reaction of a 4H-1,3-benzothiazine derivative.