A novel photoisomerzation of 1,2-benzothiazine 1,1-dioxides to 1,3-benzothiazine 1,1-dioxides

被引：9

作者：

Elghamry, Ibrahim ^{[1
]}

Doepp, Dietrich ^{[1
]}

Henkel, Gerald ^{[1
]}

机构：

[1] Univ Duisburg Essen, Inst Chem, D-47048 Duisburg, Germany

来源：

JOURNAL OF HETEROCYCLIC CHEMISTRY | 2007年 / 44卷 / 04期

关键词：

PIROXICAM-INDUCED PHOTOSENSITIVITY; PHOTOCHEMICAL RING-EXPANSION; PHOTOISOMERIZATION; ISOMERIZATION; DERIVATIVES; MECHANISM; SACCHARIN; ENIGMA;

D O I：

10.1002/jhet.5570440416

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

A novel facile photoconversion of 4-hydroxy-1,2-bezothiazine 1,1-dioxides (3a-e) into 4-oxo-1,3-2H-benzothiazine 1,1-dioxides (4a-e) and 4-hydroxy-2-methyl-N-(pyridin-2-yl)-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide (PRX) into N-methyl saccharin (2) upon 254 nm irradiation in methanol or acetonitrile is reported. The structures of the products have been elucidated by spectroscopic methods and single crystal X-ray structure determination for 4a and 4d.

引用

页码：849 / 852

页数：4

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