2-Naphthol as a powerful chromophore for the configurational assignment of carboxylic acid groups via the CD exciton chirality method
作者:Michaela Hartl、Hans-Ulrich Humpf
DOI:10.1016/s0957-4166(00)00116-6
日期:2000.5
A novel approach for the stereochemical assignment of carboxylic acid groups via the circular dichroism (CD) exciton chirality method using the 2-naphthyl chromophore is described. Direct esterification of carboxyl groups with 2-naphthol was effectively achieved with the employment of N,N-bis[2-oxo-3-oxazolidinyl]phosphorodiamidic chloride as the activating reagent. The method was tested with several model compounds, including both cyclic and acyclic dicarboxylic acids, and also applied to the natural product abietic acid. (C) 2000 Elsevier Science Ltd. All rights reserved.
New Applications of the CD Exciton Chirality Method. Stereochemical Assignment of Organic Compounds Containing Carboxylic Acid Groups
作者:Anne Fischbeck、Nana Bartke、Hans-Ulrich Humpf
DOI:10.1007/s00706-004-0277-4
日期:2005.3
CDexcitonchiralitymethods are described for the stereochemical assignment of organic compounds containing carboxylic acid groups. Using the chromophoric combination 2-naphthoate or 2-anthroate and 9-anthrylmethyl group the absolute stereochemistry of α- and β-hydroxy carboxylic acids can be deduced from a single CD measurement. Furthermore, as demonstrated with cyclic and acylic dicarboxylic acids