Insertion of Arynes into Arylphosphoryl Amide Bonds: One-Step Simultaneous Construction of C–N and C–P Bonds
摘要:
The insertion of arynes into arylphosphoryl amide bonds to synchronously construct C-P and C-N bonds is described. Arynes generated in situ from o-triflate arylsilanes under fluoride-promoted conditions insert into relatively inert P-N bonds, producing o-amine-substituted arylphosphine oxides. This process provides a simple pathway for the preparation of precursors for a number of bidentate aminophosphine ligands.
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
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
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.
Kinetics and mechanism of the pyridinolysis of <i>N</i>
-aryl-<i>P</i>
,<i>P</i>
-diphenyl phosphinic amides in dimethyl sulfoxide
作者:Arun Kanti Guha、Chan Kyung Kim、Hai Whang Lee
DOI:10.1002/poc.1788
日期:2011.6
electron‐withdrawing substituents Z in the leavinggroup. The negative sign of the cross‐interaction constants (ρXZ) for both electron‐donating (large magnitude of ρXZ = −1.54) and ‐withdrawing (ρXZ = −0.27) substituents Z indicates that the reaction proceeds through a concerted mechanism. These results are indicative of frontside and backside nucleophilic attacks at the P reaction center for electron‐donating
we devised a phosphorus-containing species as a radical precursor, but without the generation of phosphorus waste. Accordingly, a catalyst-free synthesis of phosphinic amides from hydroxyl amines and chlorophosphines via P(III) to P(V) rearrangement is described. Mechanistically, it may involve the initial formation of a R2N–O–PR2 species that undergoes homolysis of N–O bonds and subsequent radical