Novel <i>C</i>‐Thionucleosides: Synthesis and Reactions of 1,5‐ and 1,3‐Dialkyl Derivatives of (1,5‐Dithio‐1‐thiomethyl‐α‐<scp>D</scp>,<scp>L</scp>‐<i>arabino</i>pentulo‐pyranos‐1‐yl)‐1<i>H</i>‐1,2,4‐triazole Nucleosides
作者:Najim A. Al‐Masoudi、Yaseen A. Al‐Soud
DOI:10.1081/car-120034002
日期:2004.12.26
A series of novel C-thionucleosides: 1,5- and 1,3-dialkyl derivatives of (2,3,4,5-tetra-O-acetyl-1,5-dithio-1-methylthio-alpha-D,L-arabinopentulopyranos-1-yl)-1H-1,2,4-triazole nucleosides 10a-d and 17a-c were synthesized, after spontaneous rearrangements, from concerted 1,3-cycloaddition of the sugar nitrile 5 with the reactive 1-(chloroalkyl)-1-aza-2-azoniaallenes 6 and 13 in the presence of a Lewis acid. Deblocking of the acylated nucleosides afforded the free nucleosides 11a-d and 18a-c. The structures of the synthesized compounds were confirmed by H-1 NMR and mass spectra.