Dicumyl Peroxide as a Methylating Reagent in the Ni-Catalyzed Methylation of Ortho C–H Bonds in Aromatic Amides
作者:Teruhiko Kubo、Naoto Chatani
DOI:10.1021/acs.orglett.6b00658
日期:2016.4.1
The direct methylation of ortho C–H bonds in aromatic amides with dicumyl peroxide (DCP) using a nickel complex as the catalyst is reported. The reaction shows a high functional group tolerance and is inhibited by radical scavengers. In reactions of meta-substituted aromatic amides, the reaction proceeds in a highly selective manner at the less hindered C–H bonds.
The invention provides a compound of formula I:
wherein R
1
-R
6
, X, Y, and B have any of the values described herein, as well as salts of such compounds, compositions comprising such compounds, and therapeutic methods that comprise the administration of such compounds. The compounds are inhibitors of MAO-B enzyme function and are useful for improving cognitive function and for treating psychiatric disorders in animals.
The phosphorylation of the ortho CâH bonds in benzamides containing an 8-aminoquinoline moiety as a bidentate directing group with H-phosphonates using copper as a catalyst under mild temperature conditions is described. This method shows high functional group compatibility and selectively gives mono-substituted products.
effect study and computations. This new chelation-assisted, copper-mediated C-H bond amination with aqueous ammonia was successfully applied to a broad range of substrates to deliver primary anilines. Moreover, the mildconditions required for this transformation allowed the reaction to operate even under substoichiometric conditions to enable a late-stage application for the preparation of pharmaceutical
Synthesis of Acyl Phosphoramidates Employing a Modified Staudinger Reaction
作者:Iain Currie、Brad E. Sleebs
DOI:10.1021/acs.orglett.0c03987
日期:2021.1.15
A one-step synthesis of acyl phosphoramidates from a variety of functionalized acyl azides has been developed employing trimethylsilyl chloride as an activating agent in a modified Staudinger reaction. The methodology was further adapted to include the in situ generation of the acyl azides from a diverse selection of carboxylic acids and hydrazide startingsynthons. The reaction scope was extended