Synthesis and characterization of new impurities in obeticholic acid
作者:Wei-Dong Feng、Song-Ming Zhuo、Fu-Li Zhang
DOI:10.1177/1747519819875858
日期:2019.11
Novel and efficient synthetic strategies are developed for the first synthesis of two new impurities found in obeticholic acid. The synthetic routes to the impurities are designed without column purification using 4-nitrobenzoyl chloride as a selective protecting group. The impurities, which are obtained in good yields and high purity, are identified and characterized using high-resolution mass spectrometry