A metal-free approach for the synthesis of amides/esters with pyridinium salts of phenacyl bromides via oxidative C–C bond cleavage
作者:Kesari Lakshmi Manasa、Yellaiah Tangella、Namballa Hari Krishna、Mallika Alvala
DOI:10.3762/bjoc.15.182
日期:——
O-benzoylation of various amines/benzyl alcohols with pyridinium salts of phenacyl bromides is demonstrated to generate the corresponding amides and esters. This protocol facilitates the oxidative cleavage of a C–C bond followed by formation of a new C–N/C–O bond in the presence of K2CO3. Various pyridinium salts of phenacyl bromides can be readily transformed into a variety of amides and esters which is an
用苯甲酰溴的吡啶鎓盐对各种胺/苄醇进行N-和O-苯甲酰化的有效,简单和无金属的合成方法被证明可以生成相应的酰胺和酯。该方案有助于在存在K 2 CO 3的情况下促进C–C键的氧化裂解,然后形成新的C–N / C–O键。苯甲酰溴的各种吡啶鎓盐可以很容易地转化为各种酰胺和酯,这是有机合成中常规酰胺化和酯化的另一种方法。高官能团耐受性,广泛的底物范围和操作简便性是当前方案的突出优点。
Poly(methylhydrosiloxane) as a green reducing agent in organophosphorus-catalysed amide bond formation
作者:Daan F. J. Hamstra、Danny C. Lenstra、Tjeu J. Koenders、Floris P. J. T. Rutjes、Jasmin Mecinović
DOI:10.1039/c7ob01510k
日期:——
efficient organophosphorus-catalysed amidation reaction between unactivated carboxylic acids and amines. Poly(methylhydrosiloxane), a waste product of the silicon industry, is used as an inexpensive and green reducingagent for in situ reduction of phosphine oxide to phosphine. The reported method enables the synthesis of a wide range of secondary and tertiaryamides in very good to excellent yields.
Triphenylphosphine-catalysed amide bond formation between carboxylic acids and amines
作者:Danny C. Lenstra、Floris P. J. T. Rutjes、Jasmin Mecinović
DOI:10.1039/c4cc01861c
日期:——
Unactivated carboxylic acids and amines undergo organocatalytic Ph3P/CCl4-mediated amide bond formation by employing in situ reduction of triphenylphosphine oxide to triphenylphosphine in the presence of diethoxymethylsilane and bis(4-nitrophenyl)phosphate.
Synthesis of Imides and Benzoylureas by Direct Oxidation of <i>N</i>-methylenes of Amides and Benzylureas
作者:Wenhua Huang、Mei-Li Xu
DOI:10.3184/174751912x13567968693695
日期:2013.2
Some amides and benzylureas can be oxidised to imides and benzoylureas, respectively, using silver(I) nitrate (20 mol %), copper(II) sulfate pentahydrate (20 mol %), ammonium persulfate (3.0 equiv.), and potassium fluoride (20 equiv.) in water at room temperature.
A high-efficient method for the amidation of carboxylic acids promoted by triphenylphosphine oxide and oxalyl chloride
作者:Lixue Jiang、Jing Yu、Fanfan Niu、Derundong Zhang、Xiaoling Sun
DOI:10.1002/hc.21364
日期:2017.3
A effective amidation reaction of carboxylicacids with various amines promoted by triphenylphosphine oxide and oxalyl chloride under mild and neutral conditions has been developed. The feature of this procedure was the using and recycling of triphenylphosphine oxide at room temperature in 0.5 h. Furthermore a plausible mechanism also be deduced with the help of 31P NMR spectroscopy.