Synthesis of carbasugar-containing non-glycosidically linked pseudodisaccharides and higher pseudooligosaccharides
作者:Ian Cumpstey
DOI:10.1016/j.carres.2009.09.008
日期:2009.11
This minireview covers synthetic methods towards carbasugar-containing non-glycosidicallylinked pseudodisaccharides or higher pseudooligosaccharides. Carbocyclic pyranose mimetics (saturated or unsaturated between C-5 and C-5a) are linked by ether, thioether or amine bridges to carbohydrates or other carbasugars.
Synthesis of 1,2,3-Triazoles from Azide-Derivatised Aminocyclitols by Catalytic Diazo Transfer and CuAAC Click Chemistry
作者:Li Ji、Guo-Quan Zhou、Chao Qian、Xin-Zhi Chen
DOI:10.1002/ejoc.201301874
日期:2014.6
“click chemistry” were used to synthesis C7N aminocyclitol-derivatised 1,2,3-triazoles. In the course of this work, the -N=N- moiety was transferred onto C7N aminocyclitols such as validamine, valienamine and valiolamine by employing imidazole-1-sulfonyl azide as the diazo transfer reagent with catalysis by CuII, ZnII and NiII, in moderate to good yields. The obtained azidocyclitols were coupled with
pseudo-β -D-glucopyranose (13), were synthesized from D-glucuronolactone in favorable overall yields by using a stereoselective nitromethane addition reaction and a reductive elimination of an ethoxyethoxyl moiety with NaBH4 as key steps. Furthermore, a biologically active pseudo-aminosugar, validamine (18) was efficiently synthesized via a substitution reaction for an acetoxyl group at the β-position of nitro