Synthesis of imidazo-fused bridgehead-nitrogen 2′-deoxyribo-C-nucleosides: coupling-elimination reactions of 2,5-anhydro-3,4,6-tri-O-benzoyl-<scp>D</scp>-allonic acid
作者:Lars J. S. Knutsen、Brian D. Judkins、Roger F. Newton、David I. C. Scopes、Graham Klinkert
DOI:10.1039/p19850000621
日期:——
A short synthesis of imidazo-fused bridgehead-nitrogen 2′-deoxyribo-C-nucleosides has been developed. This is based on a coupling–elimination reaction of 2,5-anhydro-3,4,6-tri-O-benzoyl-D-allonic acid with a series of aminoalkyl-substituted heterocycles and alcohols. The intermediate α,β-unsaturated carboxamides and esters thus formed are converted into novel imidazo[1,5-a]pyridine, imidazo[1,5-b]pyridazine
咪唑并稠合的桥头氮的短合成2'-脱氧Ç核苷已经研制成功。这是基于2,5-脱水-3,4,6-三-O-苯甲酰基-D-脲酸与一系列氨基烷基取代的杂环和醇的偶联消除反应。如此形成的中间体α,β-不饱和羧酰胺和酯被转化为新型咪唑并[1,5- a ]吡啶,咪唑并[1,5- b ]哒嗪和咪唑并[5,1- f ] [1,2, 4]三嗪-2'-脱氧ç核苷,包括2'-脱氧和2'-脱氧腺苷的类似物。核苷的异头构型的分配是基于质子nOe实验进行的。