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An Unexpected Reaction Between 6,7-Dimethoxy-2H-1,3-benzothiazine and Dimethyl Acetylenedicarboxylate

✍ Scribed by Lajos Fodor; Gábor Bernáth; Pál Sohár; Diether Gröschl; Herbert Meier


Publisher
Springer Vienna
Year
2005
Tongue
English
Weight
116 KB
Volume
137
Category
Article
ISSN
0026-9247

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✍ Frederick Cassidy; John M Evans; Duncan M Smith; Geoffrey Stemp 📂 Article 📅 1987 🏛 Elsevier Science 🌐 French ⚖ 173 KB

The title reactions furnished the pyran ring cleaved product (3) and the tetracyclic chromene (5), rather than the expected 4-cyclicamido-3hydroxy benzopyrans (l,R=CN and NO2, respectively, n=ll). Mechanisms proposed for these reactions require a strong electron withdrawing group at C(6) in the benz