A mild and convenient synthesis of aminodeoxy sugars is described, involving the esterification of partially protected carbohydrates with trifluoromethanesulphonic anhydride and the reaction of the resulting trifluoromethanesulphonates with ammonia; the difficulties which sometines encountered in displacement reactions in carbohydrate systems are absent.
A regio- and stereoselective route from the cis-oriented epoxytriflate pentoses 1 and 4 via 4-amino-4-deoxy sugars 2 and 5 to chiral thiazoline derivatives 3a-e and 6a-e in high yields is described. (C) 2001 Elsevier Science Ltd. All rights reserved.
An Expeditious Synthesis of Optically Pure 1,4,5,6-Tetrahydro-<i>as</i>-Triazines, Fused to the Carbohydrate Skeleton
作者:Muhammad Saeed、Raid J. Abdel-Jalil、Wolfgang Voelter、Mustafa M. El-Abadelah
DOI:10.1246/cl.2001.660
日期:2001.7
An easy and high yield one pot reaction to enantiomerically pure 1,4,5,6-tetrahydro-as-triazines 5a–d and 8a–d is described, starting from benzyl 4-amino-2,3-anhydro-4-deoxy-β-l-lyxopyranoside (3) and benzyl 4-amino-2,3-anhydro-4-deoxy-α-d-lyxopyranoside (6).