STUDIES IN THE HETEROCYCLIC SERIES. IX. SYNTHESIS OF HETEROCYCLIC THIOLS

Abstract

A survey of the chemical literature recently undertaken by us, has revealed that much greater attention is being given nowadays to organo-sulfur compounds. New products containing sulfur have emerged and many of them were isolated from coal, 3 plant, animals' and soil microbes. 6 A great majority of them are, however, man-made and are obtained by intricate but often exciting synthetic procedures which give rise to new reactions, new chemistry and a great variety of potentially useful chemical compounds. These studies led to the synthesis of derivatives of phenothiazine (1)7 the sulfur analog of phenoxazine, and to dithieno(2,3-b: 2′,3′-e)(l,4)thiazine (2)′, cyclopental(1,2-b: 4,3-bf)-dithiophene (3)9 and benzothienoacridine (4) derivatives which are thiophene analogs of phenothiazine, fluorene and benz(c)acridine respectively.