A New and Efficient Synthesis of α-Amino Cycloalkyl-Phosphonic AcidsviaElectrophilic Azidation of Cycloalkylphosphonates
摘要:
alpha-Amino cyclobutyl-, cyclopentyl- and cyclohexylphosphonic acids (13) were efficiently prepared from the related unsubstituted cycloalkphosphonates (5), in three steps including electrophilic azidation of the corresponding lithiated carbanions, hydrogenation of the intermediate alpha-azido cycloalkyl-phosphonates (10) and acidic hydrolysis of the resulting alpha-amino cycloalkyl-phosphonates (12).
Hydrolyse Basique de phosphonates I. Étude qualitative
作者:Henri Christol、Michel̀e Levy、Claude Marty
DOI:10.1016/s0022-328x(00)88699-4
日期:1968.6
The hydrolysis of phosphonates by alkali in aqueousdioxane has been studied. The symmetrical phosphonates are hydrolysed with loss of one ester group to form a monoacid. With the mixed phosphonates the better leaving group is replaced.
Facile Solid‐Phase Synthesis of Cycloalkylphosphonates and 1‐Cycloalkenylphosphonates Using Polymer‐Supported Phenylsulfonylmethylphosphonates
作者:Xiao‐Ling Liu、Shou‐Ri Sheng、Wei Zhou、Qin‐Ying Wang、Xiao‐Lan Zhang、Bin Gong
DOI:10.1080/00397910600978515
日期:2007.1.1
Abstract A facile procedure for the solid‐phasesynthesis of cycloalkylphosphonates and 1‐cycloalkenylphosphonates in good yields and high purities using polystyrene‐supported phenylsulfonylmethylphosphonates with traceless sulfone linker strategy is described.
Cycloalkylphosphonates 5 with ring size varying from 4 to 6 were synthesized in good overall yields, in two steps from trichloromethylphosphonates and Ï-dibromoalkanes, via the corresponding α-trimethylsilyl cycloalkylphosphonates 4.
One-pot and efficient electrosynthesis of cycloalkylphosphonates from diisopropyl trichloromethylphosphonate using magnesium electrochemical activation
Various diisopropyl cycloalkylphosphonates were easily prepared in an one-pot sequence under mild conditions, by electrolysing diisopropyltrichloromethylphosphonate in the presence of ω,ω-dibromoalkanes. The use of an electrochemicalactivatedmagnesium amode significantly improved the rate and the yield of the two first steps of the reaction.
作者:A. I. Kuramshin、E. S. Kuramshina、R. A. Cherkasov
DOI:10.1023/a:1012352900754
日期:——
Depending on the reactant ratio and order of their mixing, reactions of dialkyl hydrogen phosphite with alkenes in the presence of catalytic amounts of homoligand carbonyl complexes of iron or chromium subgroup metals yield phosphonates by two pathways: reaction of dialkyl hydrogen phosphite with pi -coordinated alkene and addition to alkene of the product of reaction of dialkyl hydrogen phosphite with the transition metal carbonyl. The products of reactions of Fe(CO)(5) and W(CO)(6) with dialkyl hydrogen phosphites contain the phosphorus-metal bond.