From Tri‐<i>O</i>‐Acetyl‐<scp>D</scp>‐Glucal to (2<i>R</i>,3<i>R</i>,5<i>R</i>)‐2,3‐Diazido‐5‐Hydroxycyclohexanone Oxime
作者:Beata Liberek、Aleksandra Dąbrowska、Ryszard Frankowski、Zygfryd Smiatacz
DOI:10.1081/car-200040117
日期:2004.12.27
Methyl 3-azido-2,3-dideoxy-alpha/beta-D-arabino- and -alpha/beta-D-ribo-hexopyranosides were transformed into 6-iodo analogues via p-tolylsulfonyl compounds. Elimination of hydrogen iodide from 6-iodo glycosides provided methyl 4-O-acetyl-3-azido-2,3,6-trideoxy-alpha- and -beta-D-threo-hex-5-eno-pyranosides or 3-azido-4-O-p-tolylsulfonyl-2,3,6-trideoxy-alpha-D-threo- and -beta-D-erythro-hex-5-eno-pyranosides. Ferrier's carbocyclization of 4-O-acetyl-3-azido-2,3,6-trideoxy-alpha- and -beta-D-threo-hex-5-eno-pyranosides gave (2S,3R,5R)-2-acetoxy-3-azido-5-hydroxycyclohcxanone, which was converted into oxime. The 2-OAc group in oxime was substituted by azide ion to yield (2R,3R,5R)-2,3-diazido-5-hydroxycyclohexanone oxime. The configuration and conformation of all products are widely discussed on the basis of the H-1 and C-13 NMR.