Process for preparation of intermediates of carbocyclic nucleoside

Abstract

A compound of the formula: ##STR1## wherein A is a purin-9-yl group, a heterocyclic isostere of a purin-9-yl group, a pyrimidin-1-yl group or a heterocyclic isostere of a pyrimidin-1-yl group; E is hydrogen, --CH.sub.2 OH or --OH; and G and D are independently selected from hydrogen, C.sub.1 to C.sub.10 alkyl, --OH, --CH.sub.2 OH, --CH.sub.2 OR.sub.20 wherein R.sub.20 is C.sub.1 to C.sub.6 alkyl, --CH.sub.2 OC(O)R.sub.21 wherein R.sub.21 is C.sub.1 to C.sub.10 alkyl, --CH.sub.2 OC(O)CH(R.sub.22)(NHR.sub.23) wherein R.sub.22 is the side chain of any of the naturally occuring amino acids and R.sub.23 is hydrogen or --C(O)CH(R.sub.24)(NH.sub.2) wherein R.sub.24 is the side chain of any of the naturally occuring amino acids, --CH.sub.1 SH, --Ch.sub.2 Cl, --Ch.sub.2 F, --CH.sub.2 Br, --CH.sub.2 I, --C(O)H, --CH.sub.2 CN, --CH.sub.2 N.sub.3, --CH.sub.2 NR.sub.1 R.sub.2, --CO.sub.2 R.sub.1, --CH.sub.2 CH.sub.2 OH, --CH.sub.2 CH.sub.2 OR.sub.20 wherein R.sub.20 is as defined above, --CH.sub.2 CH.sub.2 OC(O)R.sub.21 wherein R.sub.21 is as defined above, --CH.sub.2 CH.sub.2 OC(O)CH(R.sub.22)(NHR.sub.23) wherein R.sub.22 and R.sub.23 are as defined above, --CH.sub.2 CH.sub.2 PO.sub.3 H.sub.2, --Ch.sub.2 OPO.sub.3 H.sub.2, --OCH.sub.2 PO.sub.3 H.sub.2 and --CH.sub.2 CO.sub.2 R.sub.3 wherein R.sub.1 and R.sub.2 are independently selected from hydrogen and C.sub.1 to C.sub.10 alkyl and R.sub.3 is hydrogen, C.sub.1 to C.sub.10 alkyl, carboxyalkyl or aminoalkyl; or a pharmaceutically acceptable salt thereof.