Continuous flow photocyclization of stilbenes – scalable synthesis of functionalized phenanthrenes and helicenes
作者:Quentin Lefebvre、Marc Jentsch、Magnus Rueping
DOI:10.3762/bjoc.9.221
日期:——
A continuous flow oxidative photocyclization of stilbenederivatives has been developed which allows the scalable synthesis of backbone functionalized phenanthrenes and helicenes of various sizes in good yields.
Synthesis of aryl(difluoromethylenephosphonates) via electrophilic fluorination of α-carbanions of benzylic phosphonates with N-fluorobenzenesulfonimide
作者:Scott D. Taylor、Christopher C. Kotoris、A.Nicole Dinaut、Mei-Jin Chen
DOI:10.1016/s0040-4020(97)10395-7
日期:1998.2
The electrophilic fluorination of a wide variety of benzylic phosphonates with N-fluorobenzenesulfonimide has been examined. The fluorination reaction proceeds well in the presence of an array of functional groups such as nitro, bromo, ketone, ester, phenyl and ether groups. Phenyl and biphenyl derivatives containing two α,α-difluoromethylenephosphonate groups can also be prepared. This procedure is
A wide range of benzyl carbonates reacted with dimethyl phosphonate or diphenylphosphine oxide in the presence of the palladium catalyst, [Pd(η3-allyl)Cl]2–DPEphos, to give dimethyl benzylphosphonates and benzyldiphenylphosphine oxides in high yields. The catalytic phosphonylation was applied to the one-pot synthesis of alkenes from the benzyl esters.
A facile synthesis of α-phosphono esters through methoxycarbonylation of α-phosphono carbanions
作者:Jon K.F. Geirsson、Jon T. Njardarson
DOI:10.1016/0040-4039(94)88430-7
日期:1994.11
This paper describes a concise and effective synthesis of methyl α-phosphonoaryl acetates, effected by reacting α-phosphonocarbanions with methyl chloroformate. Yields are high, and the purification of the products is readily achieved with column chromatography.
Synthesis of benzylic mono(α,α-difluoromethylphosphonates) and benzylic bis(α,α-difluoromethylphosphonates) via electrophilic fluorination
作者:Scott D. Taylor、A.Nicole Dinaut、Avinash N. Thadani、Zheng Huang
DOI:10.1016/0040-4039(96)01847-3
日期:1996.11
A series of benzylicmono(α,α-difluoromethylphosphonates) and benzylicbis(α,α-difluoromethylphosphonates) have been prepared viaelectrophilicfluorination of the corresponding benzylic phosphonates.