Canadian Journal of Chemistry

CHEMISTRY AND SYNTHESIS OF SOME DIHYDRO-2 Hl, 4-BENZOTHIAZINE DERIVATIVES

RN Prasad, K Tietje

Index: Prasad,R.N.; Tietje,K. Canadian Journal of Chemistry, 1966 , vol. 44, p. 1247 - 1258

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Citation Number: 18

Abstract

The formation of 3-oxo-3, 4-dihydro-2 H-1, 4-benzothiazine (III a) by cyclization of alkyl 2- haloacetamidophenyl sulfides (I) was investigated; it is proposed that the reaction proceeds via a six-membered sulfonium halide. The preparation of 4-alkyl derivatives of III a and of 4- alkyl and 4-acyl derivatives of its reduction product 3, 4-dihydro-2 H-1, 4-benzothiazine (V a) is described. Acylation of V a was shown to proceed without opening of the thiazine ring. ...

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