An NMR method for determination of configuration of β-substituted carboxylic acids
摘要:
The absolute configuration of the stereogenic center at the beta-position of a carboxylic acid can be determined via derivatization with chiral benzylic amines [PhCH(Me)NH2 or 1-NpCH(Me)NH2]. Acids of known configuration and with a variety of beta-substituents were subjected to derivatization. Analysis of the signs of the chemical shift differences of substituent protons permits determination of the absolute configuration. (C) 2000 Elsevier Science Ltd. All rights reserved.
J-104,118, a novel and potentinhibitor of squalenesynthase, was synthesized stereoselectively. The chiral amine 1 was efficiently synthesized by Sharpless asymmetric dihydroxylation as a key reaction.
A novel class of squalenesynthaseinhibitors (J-104,118 and J-104,123) were synthesized efficiently. An amine intermediate 1 was synthesized using two distinct methods. First, the racemic amine 1 was synthesized diastereoselectively using a key reaction consisting of the stereo-controlled reduction of the ketone 7 by L-Selectride®. Second, the optically active amine 1 was synthesized efficiently and
An NMR method for determination of configuration of β-substituted carboxylic acids
作者:Thomas R Hoye、Abdel-Sattar S Hamad、Dmitry O Koltun、Manomi A Tennakoon
DOI:10.1016/s0040-4039(00)00163-5
日期:2000.4
The absolute configuration of the stereogenic center at the beta-position of a carboxylic acid can be determined via derivatization with chiral benzylic amines [PhCH(Me)NH2 or 1-NpCH(Me)NH2]. Acids of known configuration and with a variety of beta-substituents were subjected to derivatization. Analysis of the signs of the chemical shift differences of substituent protons permits determination of the absolute configuration. (C) 2000 Elsevier Science Ltd. All rights reserved.