types of condensing agents have been studied. Depending on the coupling procedure and the length of a polymethylene chain of the diol, acyclic H-phosphonate diesters or cyclic phosphitetriesters were formed. The course of oxidation with iodine to produce cyclic nucleoside alkyl phosphotriesters or hydroxyalkyl nucleoside phosphodiesters can be controlled by the amount of water present in the reaction
C-15 phosphonate reagent compositions for the manufacture of compounds
申请人:Loyola University of Chicago
公开号:US05973179A1
公开(公告)日:1999-10-26
The present invention describes novel phosphonate reagent compositions of the formula: ##STR1## wherein R and R'=C.sub.1 -C.sub.4 alkyl groups, or R, R'=(CH.sub.2).sub.n (n=2 or 3) or [CH.sub.2 C(CH.sub.3).sub.2 CH.sub.2 ]. The invention also describes allylic C-15 phosphonate compounds of the formula: ##STR2## wherein R and R'=C.sub.1 -C.sub.4 alkyl groups. The invention also describes methods of preparing phosphonate reagent compositions (4), allylic phosphonate compounds (5), and lycopene.