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Cycloaddition reactions of 1.3-benzothiazines v synthesis of new tetracyclic ring systems

✍ Scribed by Lajos Fodor; János Szabó; Gábor Bernáth; Pál Sohár

Book ID: 104241351
Publisher: Elsevier Science
Year: 1984
Tongue: French
Weight: 266 KB
Volume: 25
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)90100-5

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✦ Synopsis

New tetracyclic derivatives (a;k, 5, 8) similar to protoberberinee, but containing a lactam structural element and other hetero atoms besides the bridgehead nitrogen in rings B and C, were prepared by cycloaddttion of 6,7-dimethoxy--2&1,3-benzothiazine (la) with q-substituted aromatic carboxylic acid derivatives %AT; rSibdnzoy1 chloride_ b 4) and from 4-methyl-6,7-dimethoxy-2H-1,3-benzothiazine (lb) with 3,5-Cyclic imines are easily acylated with acyl halides or anhydrides, and the resulting adducts may be used in the synthesis of heterocyclic compounds_ 3-6 Treatment of salicyl chloride (2~)~

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