Generation of phosphoranes derived from phosphites.: A new class of phosphorus ylides leading to high E selectivity with semi-stabilizing groups in Wittig olefinations

被引：167

作者：

Aggarwal, VK ^{[1
]}

Fulton, JR ^{[1
]}

Sheldon, CG ^{[1
]}

de Vicente, J ^{[1
]}

机构：

[1] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2003年 / 125卷 / 20期

关键词：

D O I：

10.1021/ja029573x

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Tosylhydrazones derived from aryl aldehydes react with t-BuOK, ClFeTPP, (MeO)3P, and aldehydes to furnish olefins with high E selectivity. These reactions occur through a Wittig-type pathway via the corresponding diazo compounds, metal carbenes and phosphorous ylides, with the water-soluble trimethyl phosphate as the byproduct. Similar reactions can also be performed using ethyl diazoacetate; however, high E selectivity was only observed in the presence of LiBr. In this case, the reaction is believed to occur via the phosphonate anion, formed through an Arbuzov reaction. Thus this olefination reaction occurs through a Horner-Wadsworth-Emmons (HWE) reaction but the phosphonate anion is generated under completely base-free conditions. Copyright © 2003 American Chemical Society.

引用

页码：6034 / 6035

页数：2

共 20 条

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