A visible-light mediated ring opening reaction of alkylidenecyclopropanes for the generation of homopropargyl radicals
作者:Xiao-Yu Zhang、Chao Ning、Ben Mao、Yin Wei、Min Shi
DOI:10.1039/d1sc01889b
日期:——
Classical cyclopropylcarbinyl radical clock reactions have been widely applied to conduct mechanistic studies for probing radical processes for a long time; however, alkylidenecyclopropanes, which have a similar molecular structure to methylcyclopropanes, surprisingly have not yet attracted researcher's attention for similar ringopeningradical clock processes. In recent years, photocatalytic NHPI
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–eliminationreaction of 2,5-anhydro-3,4,6-tri-O-benzoyl-D-allonicacid 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。
Coupling-elimination reactions of 2,5-anhydro-3,4,6-tri-O-benzoyl-d-allonic acid: synthesis of 2′-deoxyribo-C-nucleosides
作者:Lars J.S. Knutsen、Roger F. Newton、David I.C. Scopes、Graham Klinkert