A silver-initiated free-radical intermolecular hydrophosphinylation of unactivated alkenes
作者:Zejiang Li、Fenghua Fan、Zengyan Zhang、Yingxia Xiao、Dong Liu、Zhong-Quan Liu
DOI:10.1039/c5ra04136h
日期:——
A scalable, operationally easy intermolecular hydrophosphinylation of various unactivated alkenes with H–P(O) compoundsviaan Ag(i)-initiated free radical process was developed. Mechanistic studies suggest that atom transfer processes were involved in this system.
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