两个亲电子试剂之间的交叉亲电子试剂偶联是在化学计量外部还原剂存在下生成 CC 键的有效且经济的方法。在此,我们报告了一种通过可见光光氧化还原催化实现第一个无外部还原剂的交叉亲电子偶联的新策略。各种带有伯、仲和叔 CN 键的四烷基铵盐与醛/酮和 CO2 进行选择性偶联。值得注意的是,原位生成的副产物三甲胺被有效地用作电子供体。此外,该协议表现出温和的反应条件、低催化剂负载、广泛的底物范围、良好的官能团耐受性和容易的可扩展性。机理研究表明,苄基自由基和阴离子可能是通过光催化产生的关键中间体,
A nickel-catalyzed, efficient C-N bond reduction of aromatic and benzylic ammonium triflates has been developed using sodium isopropoxide as a reducing agent. The high efficiency, mild conditions, and nice compatibility...
Molecular iodine mediated oxidative cleavage of the C–N bond of aryl and heteroaryl (dimethylamino)methyl groups into aldehydes
作者:Ketan S. Mandrekar、Santosh G. Tilve
DOI:10.1039/d0nj05832g
日期:——
The oxidative cleavage of the C–N bond of aryl and heteroaryl (dimethylamino)methyl groups is achieved by employing molecular iodine as a mild oxidizing agent under ambient conditions in the presence of a mild base. The important reaction of C3 formylation of free NH and substituted indoles containing various substituents is accomplished from the corresponding Mannich bases. This methodology can also
Diverse catalytic reactivity of a dearomatized PN<sup>3</sup>P*–nickel hydride pincer complex towards CO<sub>2</sub> reduction
作者:Huaifeng Li、Théo P. Gonçalves、Qianyi Zhao、Dirong Gong、Zhiping Lai、Zhixiang Wang、Junrong Zheng、Kuo-Wei Huang
DOI:10.1039/c8cc05948a
日期:——
A dearomatized PN3P*–nickel hydridecomplex has been prepared using an oxidative addition process. The first nickel-catalyzed hydrosilylation of CO2 to methanol has been achieved, with unprecedented turnover numbers. Selective methylation and formylation of amines with CO2 were demonstrated by such a PN3P*–nickel hydridecomplex, highlighting its versatile functions in CO2 reduction.
使用氧化加成法制备了脱芳香化的PN 3 P *-氢化镍配合物。首次实现了镍催化的CO 2加氢硅烷化为甲醇,其转化率空前。此类PN 3 P *-氢化镍氢化物证明了胺与CO 2的选择性甲基化和甲酰化,突出了其在CO 2还原中的多功能性。
Synthesis of <i>N</i>-methylated amines from acyl azides using methanol
作者:Kaushik Chakrabarti、Kuheli Dutta、Sabuj Kundu
DOI:10.1039/d0ob01303j
日期:——
derivatives into N-methylamines was developed using methanol as the C1 source via the one-pot Curtius rearrangement and borrowing hydrogen methodology. Following this protocol, various functionalised N-methylated amines were synthesized using the (NNN)Ru(II) complex from carboxylic acids via an acyl azide intermediate. Several kinetic studies and DFT calculations were carried out to support the mechanism
使用甲醇作为 C1 源,通过一锅 Curtius 重排和借氢方法,将酰基叠氮化物衍生物转化为N-甲胺。按照该协议,使用 (NNN)Ru( II ) 配合物从羧酸通过酰基叠氮化物中间体合成各种功能化的N-甲基化胺。进行了几项动力学研究和 DFT 计算以支持该机制,并确定 Ru( II ) 配合物和碱在这种转变中的作用。