SELECTIVE RING-CLOSURE TO SUBSTITUTED PYRIDO [1,2-B]-AS-TRIAZINIUM SALT

被引：20

作者：

HAJOS, G

RIEDL, Z

GACSBAITZ, E

MESSMER, A

机构：

[1] Central Research Institute for Chemistry, H-1525 Budapest

来源：

TETRAHEDRON | 1992年 / 48卷 / 39期

关键词：

D O I：

10.1016/S0040-4020(01)86594-7

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Reaction of arylglyoxal with 1,2-diaminopyridinium salt 1 under acidic conditions afforded 2-aryl-pyrido[1,2-b]-as-triazinium salt 9 selectively, whereas cyclization of the same dioxo compound with 1-amino-2-iminopyridine 5 under neutral conditions - due to "umpolung" of the exo nitrogen atom - led exclusively to the 3-aryl isomer 8.

引用

页码：8459 / 8464

页数：6

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