Synthesis of biphenyl-based phosphines by Suzuki coupling
摘要:
A series of phosphine oxides has been synthesised by the palladium-catalysed Suzuki coupling of arylboronic acids with OPPh2(o-C6H4Br). Oil reduction with trichlorosilane. functionalised. biphenyl-based phosphine ligands were obtained in good yields. Our preliminary results indicate these ligands to be effective for palladium-catalysed C-C coupling reactions including the formation of their own oxides. (C) 2001 Elsevier Science Ltd. All rights reserved.
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
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
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
A novel bifunctional phosphine-catalyzed reaction was developed. Cross-RauhutâCurrier, Michael and aldol reactions were successfully combined into a domino process. This method offers a powerful approach to the construction of highly substituted cyclohexene skeletons.