Ruthenium-Catalyzed Difluoroalkylation of 8-Aminoquinoline Amides at the C5-Position
摘要:
A ruthenium‐catalyzed highly selective difluoromethylation of 8‐aminoquinoline amides at the C5 position has been developed. It tolerates a broad range of functional groups, providing the corresponding difluoromethylated products in moderate to good yields. Preliminary experimental results indicate that the tricoordinate ruthenium intermediate is the key factor in achieving the C5‐position selectivity.
Nickel-catalyzed direct alkynylation of C(sp<sup>2</sup>)–H bonds of amides: an “inverse Sonogashira strategy” to ortho-alkynylbenzoic acids
作者:Vinod G. Landge、Chinmay H. Shewale、Garima Jaiswal、Manoj K. Sahoo、Siba P. Midya、Ekambaram Balaraman
DOI:10.1039/c5cy01299f
日期:——
Nickel-catalyzed direct alkynylation of C(sp2)–Hbonds of amides using commercially available, inexpensive 8-aminoquinoline as a removable bidentate directing group is described. The present ortho-alkynylation has a broad substrate scope, functional group tolerance and high regiocontrol, and can be scaled up. The efficiency and selectivity of this strategy provide sustainable routes to a diverse array of ortho-alkynylbenzoic
A simple triphenylphosphine-ligated cobalt catalyst is reported for the direct ortho-C-H methylation and ethylation of aromatic, heteroaromatic, alkenyl, and even aliphatic carboxamides with inexpensive organoaluminumreagents in the presence of a cheap alkyl chloride as oxidant. This reaction shows monoselectivity in contrast with previously established C-H methylation methodologies.
Iron-Catalyzed C(sp<sup>2</sup>)H Alkylation of Carboxamides with Primary Electrophiles
作者:Brendan M. Monks、Erin R. Fruchey、Silas P. Cook
DOI:10.1002/anie.201406594
日期:2014.10.6
The direct ortho alkylation of 8‐aminoquinoline‐based aryl amides was achieved with primary alkyl bromides in high yields in the presence of an iron catalyst, 1,2‐bis(diphenylphosphino)ethane (dppe), and PhMgBr in 2‐MeTHF.
A Ni-catalyzed direct C–H alkylation of N-quinolylbenzamides using alkylsilyl peroxides as alkyl-radical precursors is described. The reaction forms a new C(sp3)–C(sp2) bond via the selective cleavage of both C(sp3)–C(sp3) and C(sp2)–H bonds. This transformation shows a high functional-group tolerance and, due to the structural diversity of alkylsilyl peroxides, a wide range of alkyl chains including
Rh-Catalyzed, Regioselective, C–H Bond Functionalization: Access to Quinoline-Branched Amines and Dimers
作者:M. Damoder Reddy、Frank R. Fronczek、E. Blake Watkins
DOI:10.1021/acs.orglett.6b02848
日期:2016.11.4
Rh-catalyzed, chelation-induced, C-5 regioselectiveC–Hfunctionalization of 8-amidoquinolines with a range of N-Boc aminals is reported for the first time. The addition of in situ generated imines to C(sp2)–H bonds afforded branched amines in good to excellent yields. Moreover, this transformation features good functional group compatibility, broad substrate scope, and mild reaction conditions and