Tetrahydrofuran → HCID 9828153, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 3-benzyl-2-(1-{[2-(dimethylamino)ethyl]amino}-propyl)furo[2,3-d]pyrimidin-4(3H)-one (1-6, 1 equiv) and 4-bromobenzaldehyde (2 equiv) in methanol is treated with a solution of sodium cyanoborohydride in tetrahydrofuran (1M, 2 equiv). Acetic acid is added to obtain a pH of 6–7 and the reaction is warmed at 60° C. for 18 h. An additional 2 equivalents of 4-bromobenzaldehyde and sodium cyanoborohydride are added after 18, 42 and 66 hours while maintaining the pH at 6–7 with acetic acid. After warming 90 h at 60° C., the reaction is concentrated and the residue is partitioned between EtOAc and aqueous saturated NaHCO3 solution. The organic layer is washed with brine, dried (MgSO4) and concentrated. The residue is purified by flash chromatography. Elution with EtOAc to 5% NH3-EtOH/EtOAC gives 3-benzyl-2-(1-{(4-bromobenzyl)[2-(dimethylamino)ethyl]amino}propyl)furo[2,3-d]pyrimidin-4(3H)-one (2-1).

Provenance & Evidence