Homochiral 4-hydroxy-5-hexenoic acids and their derivatives and homologues from carbohydrates
作者:Jie Song、Rawle I. Hollingsworth
DOI:10.1016/s0957-4166(01)00053-2
日期:2001.3
Efficient routes to chiral 4-hydroxy-5-hexenoic acids and lactones from D-gluconic acid-delta -lactone and L-mannonic acid-gamma -lactone are described. In this approach, the starting lactones are converted to 2,6-dibromo compounds that readily undergo zinc mediated elimination to generate the terminal alkene group in concert with 2-deoxygenation. The integrity of the remaining stereocenters is preserved during the reaction. The related important pharmaceutical intermediates (S)-3-hydroxy-4-pentenoic acid and (S)-1.3-dihydroxy-4-pentene were also prepared from 2-deoxyribose via the corresponding aldonolactone. (C) 2001 Elsevier Science Ltd. All rights reserved.