N-Boc ethyl oxamate: a new nitrogen nucleophile for use in Mitsunobu reactions
作者:Fabienne Berrée、Gwendal Michelot、Maurice Le Corre
DOI:10.1016/s0040-4039(98)01855-3
日期:1998.11
N-Boc ethyl oxamate can be directly coupled with primary and secondary alcohols under Mitsunobu conditions to afford various N-Boc amines after mild deprotection.
Convenient Synthesis of 3,4-methano-1,2,3,4-tetrahydroisoquinoline-3-carboxylic Acid and Its Derivatives as Doubly Constrained Nonproteinogenic Amino Acid Derivatives
作者:József Czombos、Wim Aelterman、Alexey Tkachev、José C. Martins、Dirk Tourwé、Antal Péter、Géza Tóth、Ferenc Fülöp、Norbert De Kimpe
DOI:10.1021/jo9917994
日期:2000.9.1
4-methano-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid in a convenient way. A detailed 2D DQF-COSY and 2D NOESY NMR analysis of the rotational isomerism of the latter bicyclic amino acid derivatives was performed. Various O- and N-protection protocols were worked out to afford access to a whole range of new derivatives of the title amino acid, suitable for peptide synthesis.