A vinyl bis-sulfone Michael type approach towards heteroatom vinylation was applied on nitrogen derivatives. Cyclic thionocarbamates-mainly 1,3-oxazolidine-2-thiones-were converted into their N-vinyl counterparts; the procedure proved particularly efficient in the case of carbohydrate-derived complex structures. (C) 2004 Published by Elsevier Ltd.
Small libraries of fused quinazolinone-sugars. Access to quinazolinedione nucleosides
Unprotected carbohydrates can readily be converted into base-modified nucleosides and deoxynucleosides through a short sequence involving the condensation of anthranilic acid derivatives with a suitably protected sugar-derived 2-alkylthio-1,3-oxazoline. (C) 2004 Elsevier Ltd. All rights reserved.
BUCHANAN, J. GRANT;MCCAIG, AVRIL E.;WIGHTMAN, RICHARD H., J. CHEM. SOC. PT 1. PERKIN TRANS.,(1990) N, C. 955-963
作者:BUCHANAN, J. GRANT、MCCAIG, AVRIL E.、WIGHTMAN, RICHARD H.
DOI:——
日期:——
The synthesis of 4-alkylsulphonyl-5-amino- and 5-amino-4-phosphono-imidazole nucleosides as potential inhibitors of purine biosynthesis
作者:J. Grant Buchanan、Avril E. McCaig、Richard H. Wightman
DOI:10.1039/p19900000955
日期:——
Conversion of 4(5)-methylthio-5(4)-nitroimidazole (11) into its silyl derivative and subsequent condensation with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofuranose (9) in the presence of trimethylsilyl trifluoromethanesulphonate for a short reaction time gave 4-methylthio-5-nitro-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)imidazole (15) with high regioselectivity; use of longer reaction times gave predominantly
The 1,3-oxazolidine-2-thiones (OZTs) are important chiral molecules, especially in asymmetric synthesis. These compounds serve as important active units in biologically activecompounds. Herein, carbohydrate anchored OZTs were explored to develop a copper-catalyzed C-S bond formation with aryl iodides. Chemoselective S-arylation was observed, with copper iodide and dimethylethylenediamine (DMEDA) as