Df. Ewing et al., A NOVEL SYNTHESIS OF MIZORIBINE(R) AND RELATED NUCLEOSIDES FROM ACYCLIC PRECURSORS, Nucleosides & nucleotides, 14(3-5), 1995, pp. 369-372
Mizoribine(R) moyl-1-beta-D-ribofuranosylimidazolium-5-olate)(13 beta)
and its 4-cyano analogue (20) were synthesized by formation of a malo
namide from 2,3-isopropylidene-D-ribosylamine and a malonic acid deriv
ative followed by amination, cyclisation and deprotection steps.