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:——
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