Highly β-stereoselective nucleosidation from α-d-xylo- and α-d-ribo-furanose 1,2-thiocarbonates
作者:Rafael Robles、Concepción Rodrı́guez、Luis Álvarez de Cienfuegos、Antonio J. Mota
DOI:10.1016/j.tetasy.2003.12.037
日期:2004.3
Cyclic 1,2-thiocarbonates of alpha-D-xylo- and alpha-D-ribo-furanoses were found to be excellent glycosyl donors in mild NIS-mediated nucleophilic substitution reactions, affording beta-nucleosides with complete stereo selectivity and moderate to high yields after treatment with persilylated pyrimidinic bases. The nucleophile is believed to open the thiocarbonate ring at the anomeric position presumably via an S(N)2 mechanism. Participation of the nucleobase silylating agent [N,O-bis(trimethylsilyl)acetamide] in the mechanism of the nucleosidation step was shown, where a large excess of it has been proven to be necessary in order to achieve high yields. Absolute configurations at C-1' were ascertained by chemical correlation synthesizing the corresponding 2,2'-anhydronucleosides. (C) 2004 Elsevier Ltd. All rights reserved.
NUCLEOSIDES WITH ANTI-HEPATITIS B VIRUS ACTIVITY
申请人:CENTRE NATIONAL DE
LA RECHERCHE SCIENTIFIQUE (CNRS)
公开号:EP1124839B1
公开(公告)日:2006-01-11
BETA-L-2'-DEOXY-NUCLEOSIDES FOR THE TREATMENT OF HIV INFECTION
申请人:CENTRE NATIONAL DELA RECHERCHE SCIENTIFIQUE
公开号:EP1124565A1
公开(公告)日:2001-08-22
AZIDO DERIVATIVES OF BETA-L-2'-DEOXY-NUCLEOSIDES FOR THE TREATMENT OF HIV INFECTION