Syntheses and Reactions of Acyclic N,N-Diacylglycines
作者:John C. Sheehan、Elias J. Corey
DOI:10.1021/ja01138a030
日期:1952.9
Esters of penaldic acid and preparation thereof
申请人:UPJOHN CO
公开号:US02555006A1
公开(公告)日:1951-05-29
The Condensation Products of Oxalyl Chloride with Monosubstituted Amides: Structure and Reactions
作者:John C. Sheehan、Elias J. Corey
DOI:10.1021/ja01122a021
日期:1952.1
An Efficient Synthesis of Aryl Phenaceturates Using Acid Catalyzed Dicyclohexylcarbodiimide Esterification and Transient<i>N</i>-<i>trent</i>-Butoxycarbonylation
作者:Daniel Cabaret、Jie Liu、Michel Wakselman
DOI:10.1055/s-1994-25507
日期:——
Application of the Holmberg procedure (DCC/pyridine/p-TSAcat) improves the yield of the direct condensation of phenols with phenylacetylglycine (1). Moreover, N-tert-butoxycarbonylation of 1 impedes an intramolecular reaction leading to an oxazolone, and allows the formation of stable aryl N-Boc phenaceturates. Then, mild cleavage of the Boc group with four equivalents of trifluoroacetic acid furnishes the aryl phenylacetylglycinate. This indirect method is more efficient than its direct analog in the case of phenols possessing electron-withdrawing substituents.