Dipotassium hydrogen phosphate powder catalyzed conversion of dialkyl 2-(2,5-dihydroxyphenyl)-3-(1,1,1-triphenyl-λ5-phosphanylidene)succinates to alkyl 6-hydroxy-2-oxo-2H-chromen-4-carboxylates

被引：19

作者：

Souldozi, A ^{[1
]}

Ramazani, A ^{[1
]}

Noshiranzadeh, N ^{[1
]}

机构：

[1] Zanjan Univ, Dept Chem, Zanjan, Iran

来源：

PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS | 2006年 / 181卷 / 03期

关键词：

dipotassium hydrogen phosphate; hydroquinone; acetylenic ester; triphenylphosphine; vinyltriphenylphosphonium salt;

D O I：

10.1080/10426500500269570

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and dialkyl acetylenedicarboxylates, by hydroquinone leads to vinyltriphenylphosphonium salts, which undergo an electrophilic substitution reaction with a conjugate base to produce corresponding stabilized phosphorus ylides. Dipotassium hydrogen phosphate powder was found to catalyze conversion of the stabilized phosphorus ylides to alkyl 6-hydroxy-2-oxo-2H-chromene-4-carboxylates under thermal or microwave irradiation in solvent-free conditions.

引用

页码：587 / 589

页数：3

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