对过氧化氢对烯基磷化合物的环氧化进行了系统的研究,结果表明,尽管烯基膦氧化物未能产生相应的环氧化物,但烯基膦酸酯或在α位具有苯基的次膦酸酯与H 2 O 2 / K 2 CO 3或烯基膦酸反应在α-或β-位具有脂族基的次膦酸与H 2 O 2 / Na 2 WO 4 / Et 3 N反应以产生高产率的相应环氧化物。
Palladium-catalyzed asymmetric hydrophosphorylation of alkynes: facile access to <i>P</i>-stereogenic phosphinates
作者:Zhiping Yang、Xiaodong Gu、Li-Biao Han、Jun (Joelle) Wang
DOI:10.1039/d0sc01049a
日期:——
asymmetric catalysis, transition metal-catalyzed methods for accessing P-chiral phosphine derivatives are still limited. Herein, a catalytic enantioselective method for the synthesis of P-stereogenic alkenylphosphinates is developed through asymmetric hydrophosphorylation of alkynes. This process is demonstrated for a wide range of racemic phosphinates and leads to diverse P-stereogenic alkenylphosphinates
Hydrophosphorylation of Alkynes Catalyzed by Palladium: Generality and Mechanism
作者:Tieqiao Chen、Chang-Qiu Zhao、Li-Biao Han
DOI:10.1021/jacs.8b00550
日期:2018.2.28
H-phosphonates disfavored the addition. For H-phosphinates and secondary phosphine oxides, Pd/dppe/Ph2P(O)OH was the catalyst of choice, which led to highly regioselective formation of the Markovnikov adducts. By using Pd(PPh3)4 as the catalyst, hypophosphinic acid added to terminal alkynes to give the corresponding Markovnikov adducts. Phosphinic acids, phosphonic acid, and its monoester were not applicable
metal catalysts in the catalytic additions of a variety of P(O)-H bonds and an S-H bond to alkynes, affording regio- and stereoselectively both the Markovnikov and the anti-Markovnikov adducts, respectively, in high yields. A related five-coordinate hydrido nickel complex in the catalysis is successfully isolated, which can react readily with an alkyne to give the addition products.
廉价的镍催化剂在催化加成各种 P(O)-H 键和 SH 键到炔烃时比相应的贵金属催化剂更具反应性,提供区域和立体选择性的马尔科夫尼科夫和反马尔科夫尼科夫加合物,分别以高产。催化剂中相关的五配位氢化镍配合物被成功分离,它可以很容易地与炔烃反应生成加成产物。
Palladium-catalysed regioselective addition reaction of ethyl phenylphosphinate with terminal acetylenes: ligand- and solvent-dependent regioselectivity
作者:Satish Kumar Nune、Masato Tanaka
DOI:10.1039/b703165c
日期:——
Palladium-1,2-bis(diphenylphosphino)ethane complex catalyses regioselective Markovnikov addition of ethyl phenylphosphinate to terminal alkynes in toluene, while the use of tri-tert-butylphosphine as the ligand or ethanol as the solvent leads to regioselectivity reversal.
Manganese(<scp>i</scp>)-catalyzed access to 1,2-bisphosphine ligands
作者:Luo Ge、Syuzanna R. Harutyunyan
DOI:10.1039/d1sc06694c
日期:——
we present the first catalyticasymmetric hydrophosphination of α,β-unsaturated phosphine oxides in the presence of a chiralcomplex of earth-abundant manganese(I). This catalytic system offers a short two-step, one-pot synthetic sequence to easily accessible and structurally tunable chiral 1,2-bisphosphines in high yields and enantiomeric excess. The resulting bidentate phosphine ligands were successfully