Ru(II)-catalyzed direct alkylation of tertiaryphosphines via hydroarylation of activated olefins promoted by mono-N-protected amino acid (MPAA) was achieved. This protocol provides a straightforward access to a large library of Buchwald-type bulky alkylated monophosphines from commercially available biaryl phosphine. Moreover, two ruthenacycle intermediates of tertiaryphosphines via C-H bond cleavage
Rhodium-Catalyzed, Phosphorus(III)-Directed Hydroarylation of Internal Alkynes: Facile and Efficient Access to New Phosphine Ligands
作者:Minyan Wang、Zhuangzhi Shi、Huanhuan Luo、Dawei Wang
DOI:10.1055/a-1314-0064
日期:2022.3
of newphosphines through Rh- or Ru-catalyzed C–H bond functionalizations, synthetic access to more diverse phosphines remains a challenge. We describe an efficient process for the rhodium-catalyzed phosphorus(III)-directed hydroarylation of internal alkynes to generate various alkenylated and 2′,6′-dialkenylated biarylphosphines with high selectivity. A range of diverse alkynes and phosphines were
P(III)-directed-catalyzed ortho C–H secondary alkylation is described. The use of highly ring-strained norbornene as a secondary alkylating reagent is the key to this transformation. A series of highly bulky ligands with a norbornyl group were obtained in excellent yields. The modified ligands with secondary alkyl group outperformed common substituted phosphines in the Suzuki–Miyaura cross-coupling reaction at a ppm
Revealing Silylation of C(sp
<sup>2</sup>
)/C(sp
<sup>3</sup>
)–H Bonds in Arylphosphines by Ruthenium Catalysis
作者:Jian Wen、Ben Dong、Jinjun Zhu、Yue Zhao、Zhuangzhi Shi
DOI:10.1002/anie.202003865
日期:2020.6.26
The first aromatic C−H silylation between arylphosphines and hydrosilanes enabled by a ruthenium complex has been developed. The excellent ortho ‐selectivity results from a four‐membered metallacyclic intermediate involving phosphorus chelation. The developed system can be extended to the benzylic C−H silylation of arylphosphines. Diverse silylated arylphosphines are produced, exhibiting broad functional
Rhodium(II)‐Catalyzed Dehydrogenative Silylation of Biaryl‐Type Monophosphines with Hydrosilanes
作者:Dingyi Wang、Yunfei Zhao、Chengkai Yuan、Jian Wen、Yue Zhao、Zhuangzhi Shi
DOI:10.1002/anie.201906975
日期:2019.9.2
situ modification of biaryl-type monophosphines with hydrosilanes through a PIII -chelation-assisted dehydrogenative silylation reaction. A series of ligands containing silyl groups with different steric and electronic properties were obtained with excellent regioselectivities. This method offers many advantages, including the use of commercially available phosphines, no requirement for an external ligand