PREPARATION AND SYNTHETIC APPLICATION OF DIETHYL 2-OXO-1,1-DIFLUOROPHOSPHONATES
作者:Hou-Jen Tsai
DOI:10.1080/10426509708043514
日期:1997.3.1
Abstract Reaction of diethyl(bromodifluoromethyl)phosphonate (EtO)2P(O)CF2Br 1 with activated zinc gave [(diethoxyphosphonyl)difluoromethyl]zinc bromide (EtO)2P(O)CF2ZnBr 2, which was acylated with various acylating agents to afford diethyl 2-oxo-1,1-difluorophosphonates (EtO)2P(O)CF2C(O)R 4 in good yields. Treatment of phosphonates 4 such as diethyl 2-oxo-1,1-difluoropropylphosphonate (EtO)2P(O)CF2C(O)CH3
Synthesis of α-fluorinated phosphonoacetate derivatives using electrophilic fluorine reagents: Perchloryl fluoride versus 1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (Selectfluor®)
作者:Mong S. Marma、Leslie A. Khawli、Vahak Harutunian、Boris A. Kashemirov、Charles E. McKenna
DOI:10.1016/j.jfluchem.2005.04.002
日期:2005.12
1051–1056], the reaction proceeded in THF without the need for DMF as a co-solvent. This method is more selective and provides greater convenience and safety than fluorination of the same substrate by treatment with t-BuOK and perchlorylfluoride (FClO3) in toluene while offering advantages over a number of previously described methods employing alternative electrophilic fluorinating reagents or other approaches
Synthesis of 1,1-Difluoroolefins Via Wittig-Horner-Emmons Reaction
作者:Hou-Jen Tsai
DOI:10.1080/10426500213415
日期:2002.8
(EtO)2P(O)CF2ZnBr, which was prepared fromdiethyl(bromodifluoromethyl)phosphonate (EtO)2P(O)CF2Br and zinc powder with an appropriate acylating reagents such as acetyl chloride CH3C(O)Cl, ethyl oxalyl chloride ClC(O)CO2Et, methyl oxalyl chloride ClC(O)CO2CH3, diethylcarbamoyl chloride ClC(O)NEt2, or ethyl chloroformate ClC(O)OEt in the solvent of monoglyme or triglyme gives diethyl 2-oxo-1,1-difluoropropylphosphonate
Catalysis of the reaction between fluorine and a range of 2-substituted carbonyl compounds has been investigated. Most notably, the preparation of diethyl-2-fluoromalonate has been achieved in high yield by fluorination of diethylmalonate in the presence of hydrated copper nitrate. Reactions between fluorine and carbanions derived from 2-substituted carbonyl compounds, including phosphonates, sulphones