A novel and efficient approach to ortho‐trialkylstannyl arylphosphanes by the reaction of arynes generated in situ with stannylated phosphanes (R3SnPR2) is described. Concurrent CP and CSn bondformation occurs with high yields, and stannylated products are easily transformed into valuable ortho‐substituted arylphosphanes. The reaction features high efficiency, good regioselectivity, and excellent
Ruthenium‐Catalyzed
<i>ortho</i>
C−H Borylation of Arylphosphines
作者:Kazuishi Fukuda、Nobuharu Iwasawa、Jun Takaya
DOI:10.1002/anie.201813278
日期:2019.2.25
Efficient, phosphine‐directed ortho C−H borylation of arylphosphine derivatives was achieved using Ru catalysts for the first time. The reaction is applicable to various tertiary arylphosphine and arylphosphinite derivatives to give (o‐borylaryl)phosphorus compounds in high yields. This reaction enables easy access to a variety of functionalizedphosphine ligands and ambiphilic phosphine boronate compounds
of boronated phosphines with an o-phenylene-bridge prepared from sec-phosphine boranes and using benzyne chemistry is reported. Successive reactions of sec-phosphine boranes with n-BuLi and 1,2-dibromobenzene, and then with boron reagents, afford the o-boronatophenylphosphine derivatives in 71% yields. The use of P-chirogenic sec-phosphine boranes leads to the free boronated phosphines with retention
Synthesis of Arylpalladium(II) Boronates: Confirming the Structure and Chemical Competence of Pre‐transmetalation Intermediates in the Suzuki–Miyaura Reaction
作者:Angus Olding、Curtis C. Ho、Allan J. Canty、Nigel T. Lucas、James Horne、Alex C. Bissember
DOI:10.1002/anie.202104802
日期:2021.6.25
in Suzuki–Miyauracross-couplings. While these typically transient species have been detected and studied spectroscopically, it is conspicuous that they have never been isolated since this important reaction was discovered over forty years ago. This study reports the synthesis of a family of unprecedented arylpalladium(II) boronates that are, by design, kinetically stable at ambienttemperature, both
钯 (II) 硼酸盐被认为是 Suzuki-Miyaura 交叉偶联中基本的预金属化中间体。虽然这些典型的瞬态物种已经被光谱检测和研究,但值得注意的是,自从四十多年前发现这一重要反应以来,它们从未被分离出来。这项研究报告了一系列前所未有的芳基钯 (II) 硼酸盐的合成,这些硼酸盐在环境温度下在溶液和固态下均具有动力学稳定性。这些特性首次实现了对其结构的明确晶体学确认,并证明了它们在 Suzuki-Miyaura 反应中的化学能力。
Stabilization of zwitterionic aryltrifluoroborates against hydrolysis
作者:Casey R. Wade、Haiyan Zhao、François P. Gabbaï
DOI:10.1039/c0cc02117b
日期:——
The presence of a proximal cationic group in zwitterionic aryltrifluoroborates such as o-(Ph2MeP)C6H4(BF3) stabilizes these compounds against hydrolysis.