Expected and Unexpected Reactions of 1,3‐Benzothiazine Derivatives. Part 1. Ring Transformation of β‐Lactam‐Condensed 1,3‐Benzothiazines into 4,5‐Dihydro‐1,4‐benzothiazepines and Indolo‐1,4‐benzothiazepines.

Lajos Fodor,Peter Csomos,Tamás Holczbauer,Alajos Kálmán,Antal Csámpai,Pál Sohár

ChemInform（2011）

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摘要

Treatment of readily prepared lactam-fused benzothiazines (III) with a large excess of sodium methoxide in methanol unexpectedly gives indolo-1,4-benzothiazepines (V) instead of the expected 4,5-dihydro-1,4-benzothiazepines (VI).

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