efficient approach for the synthesis of fluorescent 2,3-naphthalimide derivatives has been developed from readily available starting materials via an intramolecular didehydro-Diels–Alder reaction, which proceeded well under room temperature, exhibiting a wide substrate scope and good functional group tolerance. The practicability of this methodology has been verified by one-step synthesis of the environmentally
Metal‐Ligand Cooperativity in Mn
<sup>I</sup>
‐Catalysed N‐Formylation of Secondary Amides and Lactams Using CO
<sub>2</sub>
at Room Temperature
作者:Soumi Chakraborty、Rounak Nath、Anuj Kumar Ray、Ankan Paul、Swadhin K. Mandal
DOI:10.1002/chem.202202710
日期:2023.2
A MnI complex coordinated with a redox non-innocent phenalenyl (PLY) ligand is reported for catalytic N-formylation of secondary amides (including late-stage diversification of pharmaceutics) and lactams with CO2 as C1 source at room temperature for the first time. A combined approach of experimental analysis and DFT calculations sketch the plausible radical-mediated pathway of an unconventional metal-ligand
据报道, Mn I络合物与氧化还原非无害苯二甲酰 (PLY) 配体配位,首次在室温下以 CO 2作为 C 1源催化仲酰胺(包括后期药物多样化)和内酰胺的 N-甲酰化时间。实验分析和 DFT 计算的组合方法描绘了一种非常规金属-配体合作的可能的自由基介导途径,涉及以配体为中心的自由基。
<i>N</i>-acylation of amides through internal nucleophilic catalysis
An efficient method for N-acylation of amides is described using a pyridine ring as the internal nucleophilic catalyst to give imides in moderate to excellent yields. The methodology provides a facile, air insensitive, and environmentally friendly route to form diversified imide scaffolds, which exist widely in natural products and biologically active materials.
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。