PHOTOINDUCED REACTIONS .24. PHOTOSENSITIZED OXYGENATION OF HYDROXYLATED 9-PHENYLPURINES

被引：11

作者：

MATSUURA, T

SAITO, I

机构：

[1] Department of Synthetic Chemistry, Faculty of Engineering, Kyoto University, Kyoto

来源：

TETRAHEDRON | 1969年 / 25卷 / 03期

关键词：

D O I：

10.1016/S0040-4020(01)83264-6

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Photosensitized oxygenation of 1,3-dimethyl-9-phenylxanthine (5a) and 9-phenylxanthine (5b) in methanol in the presence of rose bengal gave as the major products the corresponding 4,5-dimethoxyuric acid derivatives 9a and 9b, respectively. Under similar conditions, 1,3-dimethyl-9-phenyluric acid (7a) and 9-phenyluric acid (7b) yielded 9a and 9b, respectively. In the case of 7a, 1,3-dimethyl-4-hydroxy-5-methoxy-9-phenyluric acid (10) was also obtained. Possible mechanisms involving peroxide intermediates, a 4,8-endo-peroxide 6 from 5 and a 4-hydroperoxide 8 from 6, are discussed. © 1969.

引用

页码：541 / &

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