Less Is More: N(BOH)<sub>2</sub> Configuration Exhibits Higher Reactivity than the B<sub>3</sub>NO<sub>2</sub> Heterocycle in Catalytic Dehydrative Amide Formation
作者:Christopher R. Opie、Hidetoshi Noda、Masakatsu Shibasaki、Naoya Kumagai
DOI:10.1021/acs.orglett.2c04382
日期:2023.2.3
Diboron substructures have emerged as a promising scaffold for the catalytic dehydrative amidation of carboxylic acids and amines. This Letter describes the design, synthesis, and evaluation of the first isolable N(BOH)2 compound as an amidation catalyst. The new catalyst outperforms the previously reported B3NO2 heterocycle catalyst, with respect to turnover frequency, albeit the former gradually
二硼子结构已成为羧酸和胺的催化脱水酰胺化的有前途的支架。这封信描述了第一个可分离的 N(BOH) 2化合物作为酰胺化催化剂的设计、合成和评估。就周转频率而言,新催化剂优于先前报道的 B 3 NO 2杂环催化剂,尽管前者在暴露于胺时会逐渐分解。这项工作为设计更好的直接酰胺化催化剂开辟了一条途径。
Synthesis of Acyl Fluorides from Carboxylic Acids with KI/AgSCF
<sub>3</sub>
for Efficient Amide and Peptide Synthesis
作者:Shuji Nagano、Keiji Maruoka
DOI:10.1002/adsc.202201103
日期:2023.2.7
A facile synthesis of acyl fluorides from carboxylic acids in a practical and byproduct-free manner was effected with commercially available KI/AgSCF3 reagents under conditions of high functional group tolerance, and the acyl fluoride intermediates were easily transformed to the corresponding esters, amides, and several carbon-carbon bond-forming products. This approach can be successfully applied
Brønsted acid sites in the Beta zeolite induced highly efficient amidation of styrene in the aqueous phase
作者:Jiteng Liu、Xueqin Jia、Lei Zhang、Wenqian Fu
DOI:10.1039/d3nj05870k
日期:2024.3.18
an environmentally friendly catalyst system is a highly attractive strategy for organicsynthesis. In this work, a H-form mesoporous Beta (H-MBeta) zeolite with an irregular spherical particle shape was synthesized and was found to realize the directamidation of styrene and nitriles for the synthesis of N-alkylated amides in the aqueous phase. This strong acidic H-MBeta catalyst exhibited superior activity
Oxidative nucleophilic substitution: transformation of alkylboronic derivatives
作者:Clément Cazorla、Estelle Métay、Marc Lemaire
DOI:10.1016/j.tet.2011.09.055
日期:2011.11
An efficient amidation reaction is described in this paper. Potassium alkyltrifluoroboratesalts can be transforming to amides from nitriles in the presence of copper acetate and boron trifluoride. An extension of this reaction allowed the formation of amines, ethers, and C–C bond.
aromatic and aliphatic nitriles is disclosed. In the presence of bromotriphenoxyphosphonium bromide (TPPBr 2 ), N-alkyl and N, N-dialkyl amides undergo vonBraun degradation to nitriles in good to excellent yields under the mildest conditions ever reported. The reaction proceeds via formation of an iminoyl bromide intermediate at -60 °C, which subsequently dealkylate upon refluxing in chloroform or even
公开了合成芳香族和脂肪族腈的温和程序。在溴化三苯氧基鏻 (TPBPr 2 ) 的存在下,N-烷基和 N, N-二烷基酰胺在有史以来报道的最温和条件下以良好到极好的产率经历冯布劳恩降解成腈。该反应通过在 -60 °C 下形成亚氨酰溴中间体进行,随后在氯仿中或什至在室温下回流时脱烷基化。在 N-叔丁基、N-α-苯乙基和 N-二苯甲基酰胺的情况下,在 -30 °C 下生成的氯三苯氧基氯化鏻 (TPCCl 2 ) 也是有效的。