Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
Org Lett. 2013 Jul 5;15(13):3476-9. doi: 10.1021/ol4015656. Epub 2013 Jun 26.
A mild, metal-free synthesis of pyrido[1,2-a]benzimidazoles starting with N-benzyl-2-aminopyridines, which employs PhI(OPiv)2 as a stoichiometric oxidant, has been developed. The process is initiated by an unusual PhI(OPiv)2-mediated ipso S(E)Ar reaction, followed by solvent-assisted C-C and C-N bond cleavage.
发展了一种温和、无金属的方法,从 N-苄基-2-氨基吡啶出发合成吡啶并[1,2-a]苯并咪唑,该方法使用 PhI(OPiv)2 作为化学计量氧化剂。该过程由一种不寻常的 PhI(OPiv)2 介导的 ipso S(E)Ar 反应引发,随后是溶剂辅助的 C-C 和 C-N 键断裂。