Abstract
AbstractThe synthesis of derivatives of two new heterocyclic systems, purino[8,7‐b][1,3]benzothiazine and pyrido[3′,2′:5,6][1,3]thiazino[3,2‐f]purine, was effected by the Ullmann reaction between 8‐mercaptotheophylline or 8‐bromotheophylline with the appriopriately substituted benzoic or nicotinic acid, respectively. The 8,8′‐dithiobistheophylline is also reported.
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