Generation of dialkyl phosphonodithioyl radicals and their addition onto alkenes. Synthesis of 3-phosphonodithiomethyl-3-deoxofuranosides
作者:Chrystel Lopin、Arnaud Gautier、Géraldine Gouhier、Serge R Piettre
DOI:10.1016/s0040-4039(00)01830-x
日期:2000.12
An efficient. three-step preparation of the new 2-phenylselanyl-[1,2,3]-dithiaphosphinane-2-oxide (8) from PCI, is described. The reagent is shown to behave as a precursor of the corresponding phosphonodithioyl radical, when placed in the presence of tin or silyl radicals. A novel synthesis of S,S-dialkyl phosphonodithioates is described based on these results. Application of this methodology to exocyclic 3-methylene-3-deoxofuranosides leads to the highly diastereoselective formation of 3-phosphonodithiomethyl-3-deoxofuranosides. (C) 2000 Elsevier Science Ltd. All rights reserved.