描述了通过反马尔可夫尼科夫加成反应,在镁催化下,烯烃与二氧化膦 (SPO) 发生区域选择性氢膦酰化,从而获得结构多样的有机磷化合物。该转化具有完美的原子经济性、良好的官能团耐受性以及对乙烯基芳烃和α,β-不饱和羰基衍生物的不同区域选择性。机理研究表明,活性催化物质可能是原位生成的带有 Ph 2 PO -部分的 O 结合镁络合物。
transition-metal-free t-BuOK-mediated reductive C–P cross-coupling reaction of arylvinyl sulfides with diarylphosphine oxides through C–S bondcleavage has been developed. This protocol not only permits the synthesis of diaryl(2-arylethyl)phosphine oxides, but also achieves an unprecedented construction of a C–P bond through C–S bondcleavage and reduction of a C–C double bond in one pot.
Lanthanum-Catalyzed Regioselective Anti-Markovnikov Hydrophosphinylation of Styrenes
作者:Yesmin Akter Rina、Joseph A. R. Schmidt
DOI:10.1021/acs.organomet.9b00549
日期:2019.11.11
A useful and convenient method for sp3 C–P(O) bond formation via direct regioselective hydrophosphinylation of simple and readily available alkenes using a lanthanum-based N,N-dimethylbenzylamine complex (La(DMBA)3) as a precatalyst is demonstrated. The reaction proceeds with perfect atom economy for a wide range of styrenes with secondary phosphine oxides, giving moderate to excellent yields.
t-BuOK-mediated reductive addition of P(O)–H compounds to terminal alkynes forming β-arylphosphine oxides
作者:Ji-Shu Zhang、Jian-Qiu Zhang、Tieqiao Chen、Li-Biao Han
DOI:10.1039/c7ob01104k
日期:——
novel and efficient t-BuOK-mediated reductive addition of P(O)–H compounds to terminalalkynes was developed. A variety of β-arylphosphine oxides including the valuable β-heteroarylphosphine oxides were produced in moderate to high yields under mild reaction conditions. This reaction may proceed via a tandem process involving regio-selective double addition and subsequent transfer hydrogenation.
Direct C–OH/P(O)–H dehydration coupling forming phosphine oxides
作者:Long Chen、Yueyue Zhu、Tieqiao Chen、Long Liu、Ji-Shu Zhang、Li-Biao Han
DOI:10.1039/c8ob01299g
日期:——
A t-BuONa-mediated C–OH/P(O)–H cross dehydration coupling to produce alkylphosphine oxides is developed. This reaction employed readily available alcohols and P(O)–H compounds as the starting materials, providing an efficient alternative method for constructing sp3 C–P bonds. A reasonable reaction path involving dehydration and subsequent regio-selective hydrophosphorylation of the resulting alkenes
Nickel-catalyzed coupling of R<sub>2</sub>P(O)Me (R = aryl or alkoxy) with (hetero)arylmethyl alcohols
作者:Wei-Ze Li、Zhong-Xia Wang
DOI:10.1039/d1ob00086a
日期:——
α-Alkylation of methyldiarylphosphine oxides with (hetero)arylmethyl alcohols was performed under nickelcatalysis. Various arylmethyl and heteroarylmethyl alcohols can be used in this transformation. A series of methyldiarylphosphine oxides were alkylated with 30–90% yields. Functional groups on the aromaticrings of methyldiarylphosphine oxides or arylmethyl alcohols including OMe, NMe2, SMe, CF3, Cl, and