Tetrahedron Letters,Vol.26,No.35,pp 4265-4268,1985 0040-4039/85 $3.00 + .oo Printed in Great Britain ... AN IMPROVED SYNTHESIS OF THE ANTIVIRAL ACYCLONUCLEOSIDE 9-(4-HYDROXY-3-HYDROXYMETHYLBUT-l-YL)GUANINE ... MR Harnden and RL Jarvest Beecham Pharmaceuticals Research Division, Biosciences Research Centre, Great Burgh, Epsom, Surrey KT18 5XQ, UK ... ABSTRACT: Alkylation of 2-amino-6-chloropurine with 5-(2-bromoethyl) ...