Mixing <i>O</i>-Containing and <i>N</i>-Containing Directing Groups for C–H Activation: A Strategy for the Synthesis of Highly Functionalized 2,2′-Biaryls
N-containing directing groups has been developed for the synthesis of 2,2′-biaryl via Pd-mediated C–Hbond activation and oxidative coupling. This new transformation may proceed through a mechanism involving Pd(II) and Pd(IV) intermediates. We found the use of PTSA and HFIP to be critical for the reaction and suggest that these reagents could serve as efficient ligands for this C–Cbond formation. This
and site-selective nitrate-promoted C–H bond fluorinationusing various weak coordinating amides as intrinsic directing groups was developed. Diverse tertiary and secondary amides underwent selective aromatic C–H bond fluorination, which features broad substrate scope, good regioselectivity, and mild conditions. Moreover, the late-stage C–H bond fluorination of the challenging benzeneacetamides via distal
Tf<sub>2</sub>O- and Cu(OTf)<sub>2</sub>-Assisted Acylamination Reaction of Unactivated Alcohols with Nitriles: A One-Pot P(IV) Activation, Stereoretention in Cycloalkanols and Deprotection Approach
作者:Mohammad Yaqoob Bhat、Sajjad Ahmed、Qazi Naveed Ahmed
DOI:10.1021/acs.joc.2c01251
日期:2022.9.2
Described herein is a simple, novel, one-pot acylamination reaction of unactivated alcohols. This reaction employs the combination of PCl3 and triflic anhydride (Tf2O) or copper triflate Cu(OTf)2, which serves as a source of P(IV)-activated complex for nitriles to react under the Ritter-type mechanism. The synthetic utility of Tf2O-promoted reactions was demonstrated by its effectiveness to generate different
A sustainable metal and base-free direct amidation of esters using water as a green solvent
作者:Nanthini Rajendran、Kiruthigadevi Kamaraj、Saranya Janakiraman、Mary Saral、Pierre H. Dixneuf、Charles Beromeo Bheeter
DOI:10.1039/d3ra02637j
日期:——
Herein, we report a simple and efficient synthetic approach for direct amidation of esters via C(acyl)–O bond cleavage without any additional reagents or catalysts, using only water as a green solvent. Subsequently, the reaction byproduct is recovered and utilized for the next phase of ester synthesis. This method emphasized metal-free, additive-free, and base-free characteristics making it a new,