Synthesis of (2′S,3′S)-9-(4′-phosphono-4′,4′-difluoro-2′,3′-methanobutyl)guanine and its enantiomer. Evaluation of the inhibitory activity for purine nucleoside phosphorylase
Conformationally constrained analogues 2a and ent-2a of 9-(difluorophosphonopentyl)guanines 1, a multi-substrate analogue inhibitor of PNP, were prepared from optically active trans-1-(diethoxyphosphinyl)difluromethy-2-hydroxymethylcyclopropanes (+)-6 and (-)-6, Enzymatic double resolution was applied to obtain (+)-6 and (-)-6 with high enantiomeric purity. Inhibitory activity of 2a and ent-2a were found to be 2400-fold less potent than 1. (C) 1997 Elsevier Science Ltd.
A rearrangement-based approach to secondary difluorophosphonates
作者:Afshan H. Butt、Jonathan M. Percy、Neil S. Spencer
DOI:10.1039/b005110l
日期:——
[3,3]-Claisen rearrangements allowed the conversion of a
readily available allylic difluorophosphonate to nucleic acid and inositol
phosphate-related products via epoxide cyclisation or ring closing
metathesis respectively.