Synthesis of dimethyl substituted benzimidazoles containing cyclopropane fused onto five to eight membered [1,2-a]alicyclic rings and influence of methyl group substituents on cytotoxicity of benzimidazolequinones
作者:Sarah Hehir、Liz O'Donovan、Michael P. Carty、Fawaz Aldabbagh
DOI:10.1016/j.tet.2008.02.093
日期:2008.5
hex-5-enyl-benzimidazol-2-yl)methylene]-(trans)-2,3-diphenylaziridin-1-amines (Eschenmoser hydrazones) form cyclopropane fused onto pyrrolo-, pyrido-, azepino- and azocino[1,2-a]benzimidazoles in 70, 50, 77 and 11% yield, respectively. The latter reaction also gave carbene insertion products. Dimethyl group substituents were found to significantly reduce the cytotoxicity of benzimidazolequinone towards human
热解后的5,6-二甲基-N -[(烯丙基,丁-3-烯基,戊-4-烯基和己-5-烯基苯并咪唑-2-基)亚甲基]-(反式)-2,3-二苯基叠氮丁-1-胺(Eschenmoser azo)形成环丙烷,分别以70%,50%,77%和11%的产率融合在吡咯并-,吡啶-,氮杂-和偶氮并[1,2- a ]苯并咪唑上。后者反应也得到卡宾插入产物。发现二甲基取代基显着降低了苯并咪唑醌对人皮肤成纤维细胞的细胞毒性。
Barton esters for initiator-free radical cyclisation with heteroaromatic substitution
作者:Robert Coyle、Karen Fahey、Fawaz Aldabbagh
DOI:10.1039/c3ob27313j
日期:——
first examples of efficientradicalcyclisation with (hetero)aromatic substitution via Barton ester intermediates. Cyclopropyl and alkyl radicals allow access to five, six and seven-membered alicyclic-ring fused heterocycles with and without an additional fused cyclopropane, including the skeleton of the anti-cancer agent, cyclopropamitosene, expanded, and diazole analogues. Radical initiators are not