Room temperature alkynylation of H-phosphi(na)tes and secondary phosphine oxides with ethynylbenziodoxolone (EBX) reagents
作者:C. Chun Chen、Jerome Waser
DOI:10.1039/c4cc06851c
日期:——
Highly efficient protocols for the alkynylation of H-phosphi(na)tes and secondary phosphine oxides with silyl, aryl and alkyl ethynyl-benziodoxolone (EBX) reagents are reported. Alkynyl phosphorus compounds were obtained in 69-93% yield without the need for a transition metal catalyst at room temperature under open flask conditions.
Synthesis of Building Blocks for the Development of the SUPRAPhos Ligand Library and Examples of Their Application in Catalysis
作者:P. Elsbeth Goudriaan、Xiao-Bin Jang、Mark Kuil、Renske Lemmens、Piet W. N. M. Van Leeuwen、Joost N. H. Reek
DOI:10.1002/ejoc.200800499
日期:2008.12
which widens the scope for application in asymmetric homogeneous catalysis. For example, we report the synthesis of phosphorus amidite appended porphyrins and building blocks with stereogeniccenters at the phosphorus. With the new building blocks described in this paper we can form a 450-membered SUPRAPhos library, which is based on 45 building blocks (30 pyridyl phosphorus ligands and 15 complementary
Enantioselective Synthesis of Atropisomeric Biaryls using Biaryl 2,5‐Diphenylphospholanes as Ligands for Palladium‐Catalysed Suzuki‐Miyaura Reactions
作者:Liam Byrne、Christian Sköld、Per‐Ola Norrby、Rachel H. Munday、Andrew R. Turner、Peter D. Smith
DOI:10.1002/adsc.202001211
日期:2021.1.5
describe the development of biaryl2,5‐diphenylphospholanes as a new class of C2‐symmetric, monodentate ligands for asymmetric Suzuki‐Miyaura (ASM) reactions. Screening of a series of exemplary phospholanes led to the identification of two ligands that were used to prepare a range of atropisomericbiaryl and heterobiaryl products with good to excellent levels of enantioselectivity (up to 97:3 e.r.) under
Enantiomerically pure 1,2,5-triphenylphospholane through the synthesis and resolution of the chiral trans-(2,5)-diphenylphospholanic acid
作者:Frédéric Guillen、Jean-Claude Fiaud
DOI:10.1016/s0040-4039(99)00329-9
日期:1999.4
The synthesis and resolution of trans-(2,5)-diphenylphospholanic acid 7 is described. The phosphinic acid 7 was converted into optically active (1,2,5)-triphenylphospholane 5 which was used as a chiral ligand in Rh-catalyzed hydrogenation of N-acetyl dehydrophenylalanine methyl ester to give quantitative yield of methyl N-acetylphenylalaninate with 82 % e.e.
描述了反式-(2,5)-二苯基膦酸7的合成和拆分。次膦酸7转化为旋光性(1,2,5)-三苯基膦环烷5,在Rh催化N-乙酰基脱氢苯基丙氨酸甲酯加氢反应中用作手性配体,定量得到N-乙酰基苯丙氨酸甲酯的产率为82% ee
Synthesis and first applications of a new family of chiral monophosphine ligand: 2,5-diphenylphosphospholanes
The cyclic phosphinic acid 1-hydroxy-1-r-oxo-2c,5-t-diphenylphospholane was synthesized and resolved into enantiomers through fractional crystallization of the quinine salts. The P-phenyl, P-methyl and P-benzyl tertiary phosphine oxides were obtained from the secondary phosphine oxide, reduction of the oxides afforded the corresponding tertiary P-phenyl and P-benzyl phosphines. Hydrogenation of prochiral