An organophosphorus redox‐catalyzed method for the direct electrophilic cyanation of C(sp2)–H nucleophiles with sodium cyanate (NaOCN) is reported. The catalytic deoxyfunctionalization of the OCN– anion is enabled by the use of a small‐ring phosphacyclic (phosphetane) catalyst in combination with a terminal hydrosilane O‐atom acceptor and a malonate‐derived bromenium donor. In situ spectroscopy under single‐turnover conditions demonstrate that insoluble inorganic cyanate anion is activated by bromide displacement on a bromophosphonium catalytic intermediate to give a reactive N‐bound isocyanatophosphonium ion, which delivers electrophilic “CN+” equivalents to nucleophilic (hetero)arenes and alkenes with loss of a phosphine oxide. These results demonstrate the feasibility of deoxyfunctionalization of insoluble inorganic salts by PIII/PV=O catalyzed phase transfer activation.
Chimeric Nitrate Esters and Use of the Same in a Treatment for Depression
申请人:Thatcher Gregory R.J.
公开号:US20090182011A1
公开(公告)日:2009-07-16
Chimeric nitrate esters and their use in the treatment of depression are disclosed. The chimeric nitrate esters also are useful in the treatment of depression and comorbidity associated with aging.
We herein describe an efficient iron‐catalyzed selectiveN‐methylation and N‐formylation of amines with CO2 and silane using mono‐phosphine as ligand. With commercially available [CpFe(CO)2]2 as catalyst, Fe‐catalyzed methylation of amines was achieved with triphenylphosphine as a ligand. Using tributylphosphine as a ligand, Fe‐catalyzed formylation of amines was realized at a lower temperature. The
Copper catalyzed <i>N</i>-formylation of α-silyl-substituted tertiary <i>N</i>-alkylamines by air
作者:Yichao Zhao、Lachlan David Bruce、Jianwen Jin、Bo Xia、Philip Wai Hong Chan
DOI:10.1039/d0gc01242d
日期:——
Moreover, it delinates a ligand- and additive-free amine oxidation process mediated by a low-cost metal salt with oxygen from air taking on the role of both the terminal oxidant and as part of the formylation reagent, which is unprecedented in copper catalysis. It also offers the first synthetic method that can selectively generate α-amino radical species as reactive intermediates from α-silylamines under
Selective oxygenation of C(sp3)–Hbonds adjacent to nitrogen atoms is a highly attractive strategy for synthesizing various formamide derivatives while preserving the substrate skeletons. Herein, an environmentally benign electrochemically enabled decyanative C(sp3)–H oxygenation of N-cyanomethylamines using H2O as a carbonyl oxygen atom source is described, leading to the synthesis of a large class
与氮原子相邻的C(sp 3 )–H 键的选择性氧化是合成各种甲酰胺衍生物同时保留底物骨架的极具吸引力的策略。在此,描述了使用 H 2 O 作为羰基氧原子源对N-氰基甲胺进行环境友好的电化学脱氰 C(sp 3 )–H 氧化反应,从而以良好至优异的收率合成了一大类甲酰胺,具有在无金属和无氧化剂的条件下具有广泛的底物范围。这种电化学技术突出了将N-甲酰基轻松结合到一些重要的生物活性分子中。
Iron-Catalyzed Selective Hydroboration of CO<sub>2</sub> by Cooperative B–H Bond Activation
作者:Hongjie Gao、Jiong Jia、Chen-Ho Tung、Wenguang Wang
DOI:10.1021/acs.organomet.3c00119
日期:2023.5.22
We report a novel iron(II) complex supported by an anionic phosphanyl-iminopyridinate ligand, Cp*Fe(Cy2PN═C5H4N) (1), which shows remarkable catalytic activity in the selective hydroboration of CO2 with HBpin, producing boryl formate with a turnover frequency (TOF) of ∼1176 h–1 at room temperature. This catalysis involves cooperative metal–ligand reactivity for H–B bond activation, affording a key
我们报道了一种由阴离子磷烷基亚氨基吡啶配体 Cp*Fe(Cy 2 PN=C 5 H 4 N) ( 1 )支持的新型铁 (II) 络合物,它在 CO 2与 HBpin的选择性硼氢化反应中表现出显着的催化活性,在室温下生产周转频率 (TOF) 为 ~1176 h –1的甲酸硼酯。这种催化涉及用于 H-B 键活化的协同金属-配体反应性,提供关键的 Fe(II)-H 中间体,Cp*FeH(Cy 2 PN(Bpin)C 5 H 4 N) ( 2), 在非配位氨基位点结合 Bpin 部分。非常快速和选择性的甲氧基生产可以方便地与胺的N-甲酰化相结合,从而产生各种甲酰胺。此外,在N 2下用HBpin 1也实现了将甲酸硼酯还原到CH 3 OBpin 阶段。