The synthesis of a polar cannabinoid, 5',11-dihydroxy-Delta(8)-tetrahy
drocannabinol (2), has been carried out. A key step in the synthesis i
s the reaction of an aryllithium derived from 1-(tert-butyldimethylsil
yloxy)-5-(3, 5-dimethoxyphenyl)pentane with apoverbenone. Subsequent c
onversions provided diol 2, which has significantly less affinity for
the cannabinoid receptor than Delta(8)-THC. (C) 1997 Elsevier Science
Ltd.