nickel/Lewis acid (LA) cooperative catalysis to give beta-cyano-substituted acrylates and acrylamides, respectively, in highly stereoselective and regioselective manners. The resulting adducts serve as versatile synthetic building blocks through chemoselective transformations of the ester, amide, and cyano groups as demonstrated by the synthesis of typical structures of beta-cyano ester, beta-amino
作者:Kristina Holzschneider、Andreas P. Häring、Alexander Haack、Daniel J. Corey、Thorsten Benter、Stefan F. Kirsch
DOI:10.1021/acs.joc.7b01019
日期:2017.8.4
acetates are converted into tetrazoles through the treatment with bases. The reaction of dichloro ketones with azide anions provides acyl azides, through in situ formation of diazido ketones. We present experimental and theoretical evidence that both fragmentations may involve the generation of acyl cyanideintermediates. The controlled degradation of terminal alkynes into amides (by loss of one carbon)
Solvent-Free Synthesis of Cyanoformamides from Carbamoyl Imidazoles
作者:Jeremy Nugent、Sarah G. Campbell、Yen Vo、Brett D. Schwartz
DOI:10.1002/ejoc.201700974
日期:2017.9.15
Secondary and tertiary cyanoformamides have been synthesized with a solvent-free approach from carbamoyl imidazoles and TMSCN. This method negates the need to use large excesses of toxic reagents and is amenable to large-scale synthesis.
Cleavage of 1,3-dicarbonyls through oxidative amidation
作者:Phillip Biallas、Andreas P. Häring、Stefan F. Kirsch
DOI:10.1039/c7ob00731k
日期:——
A mild and convenient protocol for the oxidative cleavage of 1,3-diketone compounds is described. Under metal-free conditions, the method converts the 1,3-dicarbonyls into amides when treated with (nBu4N)N3 and iodine in the presence of an amine at room temperature. Using this method, a range of 1,3-dicarbonyls with various structural motifs including sterically demanding substituents and ordinary
描述了一种温和方便的方案,用于1,3-二酮化合物的氧化裂解。在无金属的条件下,该方法在室温下在胺的存在下用(n Bu 4 N)N 3和碘处理时,可将1,3-二羰基化合物转化为酰胺。使用这种方法,很容易将一系列具有各种结构基序的1,3-二羰基(包括空间上必不可少的取代基和普通官能团)片段化,并证明环状的1,3-二羰基可以通过开环直接转化为无环二酰胺。 。最初的机理研究表明,烯醇形式的叠氮化后是胺的亲核取代。
Reduction of the Carbamate Pesticides Oxamyl and Methomyl by Dissolved Fe<sup>II</sup> and Cu<sup>I</sup>
作者:Timothy J. Strathmann、Alan T. Stone
DOI:10.1021/es001824j
日期:2001.6.1
carbamates undergo a net two-electron reduction that is coupled to the sequential one-electron oxidation of two Fe(II) ions. The observed products are a substituted nitrile, methanethiol, and methylamine. A radical intermediate is inferred by polymerization of the radical scavenger acrylonitrile. Redox kinetics (i) vary with carbamate identity, (ii) exhibit first-order dependence on both Fe(II) and carbamate