The stereoselective synthesis of cyclopropylphosphonate analogs of nucleotides
作者:Jung Hwan Hah、Jun Mo Gil、Dong Young Oh
DOI:10.1016/s0040-4039(99)01747-5
日期:1999.11
1-Alkenylphosphonic acid derivatives of purines have been proven to exhibit significant antiviral activity among these series of compounds. Here we disclose the stereoselectivesynthesis of the constrained analogs of 1-alkenylphosphonate derivatives of purines via intramolecular epoxide opening reaction of γ,δ-epoxyalkanephosphonates with subsequent Mitsunobu coupling reactions with purine bases.
Cycloaddition of Nitrile Oxides to Unsaturated Phosphonates
作者:Shi Yong Lee、Bum Sung Lee、Chi-Wan Lee、Dong Young Oh
DOI:10.1080/00397919908085997
日期:1999.10
Abstract The 2-isoxazohes and isoxazole functionalized with phosphonate group were synthesized by the 1,3-dipolar cycloaddition reaction of nitrile oxides with various unsaturated phosphonates.
A new methodology has been developed for the P-C bond cleavage of beta-carbonyl phosphonates. The alpha,alpha-disubstituted beta-keto phosphonates and the alpha-carbamoyl phosphonates have been shown to undergo dephosphonylation by reaction of their lithium enolate with LiAlH4, followed by quenching with aqueous H2SO4, affording regioselectively alpha,alpha-disubstituted ketone and alpha-substituted and alpha,alpha-disubstituted secondary amides.
Savignac,P. et al., Synthetic Communications, 1979, vol. 9, p. 487 - 496
作者:Savignac,P. et al.
DOI:——
日期:——
Studies on the free radical carbon-carbon bond formation in the reaction of α-phosphoryl sulfides and selenides with alkenes
作者:Piotr Bałczewski、Witold M. Pietrzykowski、Marian Mikołlajczyk
DOI:10.1016/0040-4020(95)00393-m
日期:1995.7
alpha-Mono- and alpha, alpha-disubstituted alpha-phosphoryl radicals 9 were generated from the easy accessible alpha-phosphoryl sulfides 4, 5 and alpha-phosphoryl selenides 11, 12 and reacted with the electron rich alkenes 6 under the reductive (n-Bu(3)SnH/AIBN) conditions to give the functionalized phosphonates 7 in 32 divided by 68% yield. Two fragmentation processes of the phosphonate a-alkoxy alkyl radicals are also described.