Direct <i>gem</i>-difluoromethylenation of sp<sup>3</sup>-hybridized carbon center through copper-mediated radical/radical cross-coupling for the construction of a CH<sub>2</sub>–CF<sub>2</sub> linkage
An efficient gem-difluoromethylenation of benzyl bromides through copper-mediated direct radical/radical C–C cross-coupling has been developed for the construction of CH2–CF2 linkage.
Preparation of 2-fluoroalkylbenzimidazoles from N-aryl trifluoroacetimidoyl (or bromodifluoroacetimidoyl) chlorides and primaryamines has been achieved viacopper(I)-catalyzed tandem reactions.
Enhancement of Neighbouring-Group Participation in Cu<sup>0</sup>-Promoted Cross-Coupling<i>gem</i>-Difluoromethylenation of Aryl/Alkenyl Halides with 1,3-Azolic Difluoromethyl Bromides
3‐azolic (oxa‐, thia‐ or aza‐) difluoromethyl bromides or 2‐bromodifluoromethyl‐1,3‐oxazoline has been developed for the construction of pharmaceutically important gem‐difluoromethylene‐linked twin molecules. The unique π‐conjugated aryl‐fused 1,3‐azolic moiety in difluoromethyl bromide substrates could stabilise the reaction intermediates, which promotes the reactivities, providing facile access to the
Synthesis of N-Substituted 2-Fluoromethylbenzimidazoles via Bis(trifluoroacetoxy)iodobenzene-Mediated Intramolecular Cyclization of N,N′-Disubstituted Fluoroethanimidamides
作者:Yongming Wu、Jiangtao Zhu、Haibo Xie、Zixian Chen、Shan Li
DOI:10.1055/s-0029-1218377
日期:2009.12
A mild and efficient method for the synthesis of N-substituted 2-fluoromethylbenzimidazoles via [bis(trifluoroacetoxy)-iodo]benzene-mediated intramolecular cyclization of N,N'-disubstituted bromodifluoro (or trifluoro) ethanimidamides was described.