Novel cycloaddition of 2-alkyl-3-benzoyl-2-thianaphthalenes
Abstract
Deprotonation of 2-alkyl-3-benzoyl-2-thiochromenium salts 1 or 2 with 2 equiv. of triethylamine in ethanol affords the unexpected benzothiopyran derivatives 3 and 4; the structure of 3a is confirmed by X-ray crystallography.