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).
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.
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).
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.