W. Kim et al., An efficient synthesis of (+/-)-cis-2-amino-6-hydroxy-9-[4 '-hydroxyethyl-2 '-cyclopenten-1 '-yl]purine, HETEROCYCLE, 53(1), 2000, pp. 219-224
The synthesis of a carbovir analogue, (+/-)-cis-2-amino-6-hydroxy-9-[4'-hyd
roxyethyl-2'-cyclopenten-1'-yl]purine (2) was achieved from 2,5-norbornadie
ne (3) in six steps and 31% overall yield. This route involves a Meinwald r
earrangement, one-pot operation (acid-hydrolysis and subsequent sodium boro
hydride reduction), and a Pd(0)-catalyzed coupling reaction.