Study on the diastereoselective synthesis of dithymidine phosphorothioates through a d-xylose derived chiral auxiliary and development of a novel catalyst
作者:Yixin Lu、George Just
DOI:10.1016/s0040-4039(00)01678-6
日期:2000.11
1,2-Di-O-isopropylidene-3-C-cyanoethyl-5-deoxy-5-isopropylamino-D-xylofuranose 16a was synthesized The use of 16a as a chiral auxiliary led to the diastereoselective formation of dithymidine phosphorothioate. The chiral auxiliary was easily removed by treatment with concentrated ammonia. 2-Mesityl-4,5-dicyanoimidazole displays higher diastereoselectivity than the 2-bromo-4,5-dicyanoimidazole in the coupling reaction. (C) 2000 Elsevier Science Ltd. All rights reserved.