已开发了用于合成芳基酮的各种N-甲基-N-甲苯磺酰基酰胺与二芳基硼酸的改进的酰基交叉偶联。在大多数情况下,在3当量的存在下,通过使用1mol%的2,6-二异丙基苯基咪唑基亚甲基和3-氯吡啶共负载的氯化钯作为催化剂,可以以优异的产率获得芳基酮。在回流的THF中,以K 2 CO 3为碱。容易制备且具有成本效益的底物,N-甲基-N-甲苯磺酰胺和二芳基硼酸,以及可商购的催化剂体系,保证了实用和有效地获得芳基酮。
Catalyst-Free, Metal-Free, and Chemoselective Transamidation of Activated Secondary Amides
作者:Srinivasan Chandrasekaran、Rajagopal Ramkumar
DOI:10.1055/s-0037-1610664
日期:2019.2
well. The present methodology appears to be better than the other catalyzed transamidations reported recently. A simple protocol, which is catalyst-free, metal-free, and chemoselective, for transamidation of activated secondary amides in ethanol as solvent under mild conditions is reported. A wide range of amines, amino acids, amino alcohols, and the substituents, which are problematic in catalyzed transamidation
Visible light mediated oxidation of benzylic sp<sup>3</sup> C–H bonds using catalytic 1,4-hydroquinone, or its biorenewable glucoside, arbutin, as a pre-oxidant
作者:Laura C. Finney、Lorna J. Mitchell、Christopher J. Moody
DOI:10.1039/c7gc03741d
日期:——
a sustainable alternative for the late stage oxidative functionalization of benzylicC–Hbonds. It is applicable to a range of cyclic benzylic ethers such as isochromans and phthalans, and simple benzyl alkyl ethers. It can also be applied in the oxidation of benzylic amines into amides, and of diarylmethanes into the corresponding ketones. Mechanistic studies suggest that the reaction proceeds by
作者:Bryan J. Simmons、Nicholas A. Weires、Jacob E. Dander、Neil K. Garg
DOI:10.1021/acscatal.6b00793
日期:2016.5.6
We report the catalytic alkylation of amidederivatives, which relies on the use of nonprecious metal catalysis. Amidederivatives are treated with organozinc reagents, utilizing nickel catalysis, to yield ketone products. The methodology is performed at ambient temperature and is tolerant of variation in both coupling partners. A precursor to a nanomolar glucagon receptor modulator was synthesized
A practical method is disclosed for the reduction of activated primary and secondary amides into aldehydes using diisobutylaluminum hydride (DIBAL-H) in toluene. A wide range of aryl and alkyl N-Boc, N,N-diBoc and N-tosyl amides were converted into the corresponding aldehydes in good to excellent yields. Reduction susceptible functional groups such as nitro, cyano, alkene and alkyne groups were found