Triethylamine → 9-(3-Benzoyloxypropoxymethyl)guanine

Participants

Reaction Steps

A solution of trimethylsilylated guanine in benzene (25 ml) prepared as in Example 6 (from 2.0 g of guanine) containing triethylamine was heated at reflux and 3-benzoyloxy-propoxymethyl chloride (2.96 g) dissolved in benzene (15 ml) was added over a 3 hour period. The reaction mixture was heated at reflux under nitrogen overnight. The solvent was removed under reduced pressure, and 95% ethanol and methanol were added to the residual oil. The mixture was heated on a steam bath for several minutes and the solvent then evaporated under reduced pressure. Chloroform (200 ml) was added and the resulting solid removed by filtration. The solid was dissolved in a minimal amount of DMF, filtered (to remove any guanine present) and reprecipitated by the addition of water. Recrystallization from methanol (with charcoaling) gave 9-(3-benzoyloxypropoxymethyl)guanine (0.94 g) as a pale yellow solid, m.p. 198°-201° C.

Provenance & Evidence