本发明公开了一种可见光催化的 N ‑甲酰基酰胺化合物的制备方法,该方法中以LED灯作为光源提供能量,经济易得的二、三级酰胺作为反应底物,氯化铜为催化剂,氧气为氧化剂,市场可购买的盐酸为添加剂,硝基甲烷为溶剂。与现有技术相比较,本发明方法具有以下优点:1)采用绿色、温和、环境友好的可见光催化的反应模式;2)反应体系简单且底物范围广,芳香族和脂肪族酰胺均适用于该方法;3)氧气作为绿色的氧化剂;4)反应产率较高;5)操作比较简单;6)原料廉价易得。
An NHC‐Stabilised Phosphinidene for Catalytic Formylation: A DFT‐Guided Approach
作者:P. Sreejyothi、Kalishankar Bhattacharyya、Shiv Kumar、Pradip Kumar Hota、Ayan Datta、Swadhin K. Mandal
DOI:10.1002/chem.202101202
日期:2021.8.11
In recent years, the applications of low-valent main group compounds have gained momentum in the field of catalysis. Owing to the accessibility of two lonepairs of electrons, NHC-stabilised phosphinidenes have been found to be excellent Lewis bases; however, they cannot yet be used as catalysts. Herein, an NHC-stabilised phosphinidene, 1,3-dimethyl-2-(phenylphosphanylidene)-2,3-dihydro-1H imidazole
近年来,低价主族化合物在催化领域的应用得到了蓬勃发展。由于两个孤对电子的可及性,已发现 NHC 稳定的膦亚基是极好的路易斯碱;然而,它们还不能用作催化剂。在此,报道了一种 NHC 稳定的膦亚基,1,3-二甲基-2-(苯基亚膦基)-2,3-二氢-1 H咪唑 (1),用于活化 CO 2。对 CO 2活化的仔细检查通过 DFT 计算以及本征键轨道分析的过程表明,膦亚基通过两个苯环之间的非共价 π-π 相互作用与苯基硅烷相关联,这激活了 Si-H 键,促进了氢化物转移到 CO 2分子。详细的 DFT 研究与光谱实验相结合,以了解 CO 2活化的机制及其催化还原官能化,导致一系列化学惰性伯酰胺在温和反应条件下甲酰化。
Otherwise inert reaction of sulfonamides/carboxamides with formamides via proton transfer-enhanced reactivity
NBS-mediated addition–elimination reaction of sulfonamides/carboxamides and formamides afforded N-sulfonylamidines and N-formylarylamides, respectively, depending on the different mechanism of elimination. Hydrogen bond-induced proton transfer leads to enhanced reactivities and was proposed as the key driving force for the reaction to take place. The protocol demonstrates the possibility of constructing chemical bonds based on a proton transfer strategy induced by noncovalent hydrogen bond interaction.
Metal-Free Catalytic Formylation of Amides Using CO<sub>2</sub>under Ambient Conditions
作者:Pradip Kumar Hota、Samaresh Chandra Sau、Swadhin K. Mandal
DOI:10.1021/acscatal.8b04023
日期:2018.12.7
This study reports the metal-free formylation of amides using carbon dioxide under ambient conditions. An abnormal N-heterocyclic carbene (aNHC) acts as an efficient catalyst for the formylation of amides in the presence of hydrosilane at room temperature. This methodology enables the formation of a C–N bond and can be utilized in building up core moieties of two natural products having strong larvicidal
Iodine and ammonium persulfate mediated activation of DMSO: an approach to <i>N</i>-formylation of amides and synthesis of isatins
作者:Showkat Ahmad Bhat、Mohammad Yaqoob Bhat、Suhail A. Rather、Ifshana Gani、Khursheed Ahmad Bhat、Qazi Naveed Ahmed
DOI:10.1039/d2ob01599d
日期:——
An efficient strategy towards N-formylation of amides and oxidation of indolines to isatins is described.
描述了一种高效的策略,用于酰胺的N-甲酰化和吲哚烷的氧化成为吲哚酮。
Methods for producing optically active alpha-hydroxy amides
申请人:Ishihara Kohji
公开号:US20050202545A1
公开(公告)日:2005-09-15
An objective of the present invention is to provide efficient methods for producing (R)-2-chloromandelamide with high optical purity. Another objective of the present invention is to provide novel methods for producing α-ketoamide reductases that reduce 2-chlorobenzoyl formamide to (R)-2-chloromandelamide with high optical purity, using NADPH as the coenzyme.
An enzyme exhibiting high stereoselectivity was purified from a number of
Saccharomyces cerevisiae
enzymes with 2-chlorobenzoyl formamide-reducing activity, and the biochemical properties of the purified enzyme were analyzed. The analysis of a partial internal amino acid sequence of the purified enzyme revealed that the enzyme may be encoded by the putative open reading frame (ORF) YDL124w reported in the genome analysis. YDL124w was cloned and expressed in
E. coli
, and was subsequently shown to encode the α-ketoamide reductase. It was found that these resulting transformants facilitated the production of (R)-2-chloromandelamide from 2-chlorobenzoyl formamide.