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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 25, 1995 - Issue 24
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Original Articles

A Convenient N-Protection of Pyroglutamate Derivatives

Hao Li Faculty of Pharmaceutical Sciences, Josai University, Keyakidai 1-1, Sakado, Saitama, 350-02, Japan
,
Takeshi Sakamoto Faculty of Pharmaceutical Sciences, Josai University, Keyakidai 1-1, Sakado, Saitama, 350-02, Japan
,
Miyako Kato Faculty of Pharmaceutical Sciences, Josai University, Keyakidai 1-1, Sakado, Saitama, 350-02, Japan
&
Yasuo Kikugawa Faculty of Pharmaceutical Sciences, Josai University, Keyakidai 1-1, Sakado, Saitama, 350-02, Japan
Pages 4045-4052 | Received 27 Mar 1995, Published online: 23 Sep 2006
 
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Abstract

Esters of pyroglutamic acid were N-protected by conventional protective groups (Z. Boc, and COOMe) in high yield, without racemization, using LiHMDS in THF at - 78 °C and ZCl, Boc2O, and ClCOOMe, respectively.

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