Iron‐Catalyzed Intermolecular Azidabenzoyl Difluoromethylation of Alkenes to Access
β
‐Difluoroacyl Azides
摘要:
AbstractA Fe(II)‐catalyzed three‐component reaction of 2‐iodo‐2,2‐difluoroacetophenones, alkenes and TMSN3 is described, which provides a particularly valuable route to access difluoroalkylated azides with high yields. The method permits the efficient azidation of varied β‐difluoroacyl‐benzylic radicals in mild conditions with high functional group tolerance. Preliminary mechanistic investigation indicated that a radical‐mediated process was involved in this azidadifluoroacylation reaction.
Cu(I)‐catalyzed three‐component reaction of 2‐iodo‐2,2‐difluoroacetophenones, alkynes, and TMSCN for the synthesis of useful difluoroacyl‐substituted nitriles is described. This method has broad substrate scope and excellent stereoselectivity. Preliminary mechanistic investigation indicated that a radical‐mediated process was involved in this cyanodifluoroalkylation reaction.
Magnesium-Promoted Additions of Difluoroenolates to Unactivated Imines
作者:Alex L. Nguyen、Hari R. Khatri、James R. Woods、Cassidy S. Baldwin、Frank R. Fronczek、David A. Colby
DOI:10.1021/acs.joc.7b03014
日期:2018.3.16
produce fluorinated and trifluoromethylated organic structures, the construction of difluoromethylated compounds remains a synthetic challenge. We have discovered that unactivated imines will react with difluoroenolates under exceedingly mild conditions when using magnesium salts and organic bases. We have applied this approach to the iminoaldol reaction to produce difluoromethylene groups as α,α-dif
A visible light promoted C(sp3)–H difluoromethylation of tetrahydroisoquinolines that uses stable and easily prepared α,α-difluorinated gem-diol as the CF2 source is disclosed.
thylation of alkenes with iododifluoromethylketones and TMSCN has been reported, which provides a particularly valuable route to access chiral β-difluoroacyl nitriles with excellent enantioselectivities. The method permits the efficient cyanation of varied β-difluoroacyl-benzylic radicals in mild conditions with high functional group tolerance. The reaction proceeds through a radical pathway. In order