Abstract2,5‐Disubstituted oxazoles with a variety of alkyl and aryl groups are efficiently formed from N‐acylamino acids, by a one‐pot radical decarboxylation–oxidation–enolization and iodine‐promoted cyclization process. Remarkably, the reaction takes place under mild conditions, and no metal catalysis is needed. The process can be useful for the direct modification of small peptides.magnified image
One-Pot Conversion of Amino Acids into 2,5-Disubstituted Oxazoles: No Metals Needed
作者:Ivan Romero-Estudillo、Venkateswara Rao Batchu、Alicia Boto
DOI:10.1002/adsc.201400496
日期:2014.12.15
Abstract2,5‐Disubstituted oxazoles with a variety of alkyl and aryl groups are efficiently formed from N‐acylamino acids, by a one‐pot radical decarboxylation–oxidation–enolization and iodine‐promoted cyclization process. Remarkably, the reaction takes place under mild conditions, and no metal catalysis is needed. The process can be useful for the direct modification of small peptides.magnified image
An approach to trapping .gamma.-glutamyl radical intermediates proposed for vitamin K dependent carboxylase: .alpha.,.beta.-methyleneglutamic acid
作者:James T. Slama、Rajiv K. Satsangi、Anne Simmons、Vincent Lynch、Randall E. Bolger、John Suttie
DOI:10.1021/jm00164a056
日期:1990.2
beta-methyleneglutamate diethyl ester. Saponification of a N-protected methyleneglutamic acid dialkyl ester using limiting alkali was shown to selectively yield the alpha-alkyl ester gamma-acid. The reaction was used to produce alpha,beta-cyclopropane-containing analogues of the carboxylase substrates N-t-Boc-L-glutamic acid alpha-benzyl ester and N-benzoyl-L-glutamic acid alpha-ethyl ester. The cyclpropane-containing