Z-芳基二甲基(1),甲基苯基(2)和联苯(3)与X-苯胺的次膦酸盐二甲基亚砜在60.0°C下进行了动力学研究。动力学结果产生基本法线氘 涉及氘的动力学同位素效应(DKIE) 苯胺 (XC 6 H 4 ND 2)亲核试剂k H / k D = 1.03-1.17、1.15-1.29和1.24-1.51,以及交叉相互作用常数(CIC),ρ XZ= 0.37,0.34,和0.65 1,2,和3,分别。配体(R 1和R 2)对反应速率的空间效应起作用,但与其他反应相比要小得多次膦酸酯系统。基于CICs的正号,提出了一种具有限速的离去基团从中间体中逐出的逐步机制。主要的正面亲核攻击通过氢键合的,四-中心型过渡状态,提出了原代正常DKIEs和CIC的用于大幅度的基础上2和3,而这两个正面和背面攻击提出相对小的一次正常DKIEs的用于基础上1。
Redox-Neutral P(O)–N Coupling between P(O)–H Compounds and Azides via Dual Copper and Photoredox Catalysis
作者:Yanan Wu、Ken Chen、Xia Ge、Panpan Ma、Zhiyuan Xu、Hongjian Lu、Guigen Li
DOI:10.1021/acs.orglett.0c02207
日期:2020.8.7
We report a redox-neutral P(O)–N coupling reaction of P(O)–H compounds with azides via photoredox and copper catalysis, providing new access to useful phosphinamides, phosphonamides, and phosphoramides. This transformation tolerates a wide range of nucleophilic functionalities including alcohol and amine nucleophiles, which makes up for the deficiency of classical nitrogen nucleophilic substitution
Practical Synthesis of Phosphinic Amides/Phosphoramidates through Catalytic Oxidative Coupling of Amines and P(O)−H Compounds
作者:Chen Tan、Xinyuan Liu、Huanxin Jia、Xiaowen Zhao、Jian Chen、Zhiyong Wang、Jiajing Tan
DOI:10.1002/chem.201904237
日期:2020.1.16
Herein, we report a highly efficient ZnI2 -triggered oxidative cross-coupling reaction of P(O)-H compounds and amines. This operationally simple protocol provides unprecedented generic access to phosphinic amides/phosphoramidate derivatives in good yields and short reaction time. Besides, the reaction proceeds under mild conditions, which avoids the use of hazardous reagents, and is applicable to scale-up
Ligand-free copper-catalyzed denitrogenative arylation of phosphorylamides with arylhydrazines
作者:Qiao Zhu、Shiying Che、Zhenghong Luo、Zijian Zhao
DOI:10.1080/00397911.2020.1725577
日期:2020.4.2
Abstract A straightforward arylation of phosphorylamides with arylhydrazines hydrochloride was herein demonstrated. The protocol proceeded in the presence of a catalytic loading of Cu(OAc)2 as the catalyst, DTBP as the external oxidant and Cs2CO3 as the base, but without any ligands. And a series of N-aryl phosphorylamides were successfully obtained in high efficiency (up to 93% yields) with good substituents
Base-Catalyzed Hydrophosphination of Azobenzenes with Diarylphosphine Oxides: A Precise Construction of N-N-P Unit
作者:Gang Hong、Xiaoyan Zhu、Chen Hu、Alfred Njasotapher Aruma、Shengying Wu、Limin Wang
DOI:10.1021/acs.joc.6b01210
日期:2016.8.5
Addition of diarylphosphine oxides to the N═N double bond of azobenzenes leads to the formation of the P-substituted hydrazines in up to 98% yield for 24 examples, and the formation of diphenylphosphinic amides was observed in three substrates. This strategy features tolerance of a wide range of functional groups, simple operation, and mild reaction conditions. Specially, this method can be also applied
The Chan-Evans-Lam N -arylation of phosphonic/phosphinic amides
作者:Yuqin Xu、Qiong Su、Wanrong Dong、Zhihong Peng、Delie An
DOI:10.1016/j.tet.2017.06.028
日期:2017.8
A stoichiometric copper(II)-mediated arylation protocol of phosphinamides and phosphonamides was herein demonstrated. Various unreported N-aryl phosphinamides and phosphonamides were successfully prepared through Chan-Evans-Lam reaction with high efficiency (up to 88% yields) and good functional groups tolerance (30 examples) in the absence of any ligands or co-catalysts.