Triphenylphosphine → 6-acetylamino-pyridine-2-carboxylic acid {4-[3-cyclopropylmethyl-1-(2-fluorobenzyl)-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-ylmethyl]-phenyl}-methyl-amide

Participants

Reaction Steps

N-Acetyl-6-amino-pyridine-2-carboxylic acid (12.4 mg, 0.069 mmol) was placed in a flask and dry dichloromethane (1 mL) was added. The resulting suspension was stirred in an ice-water bath and PPh3 (18.5 mg, 0.071 mmol) was added followed by N-chlorosuccinimide (8.9 mg, 0.067 mmol). This mixture was stirred in the cooling bath for ½ h and then the cooling bath removed. After stirring at room temperature for 15 min, 3-cyclopropylmethyl-8-[4-(methylamino)-benzyl]-1-(2-fluorobenzyl)-3,7-dihydropurine-2,6-dione (57.7 mg, 0.131 mmol) was added. The reaction was then stirred at room temperature for 48 h. The solids were filtered off and washed with dichloromethane and the filtrate diluted with dichloromethane (20 mL) and washed once with saturated aqueous sodium bicarbonate, dried and concentrated to give 55.6 mg of a yellow foam. The product was purified by chromatography using silica gel eluted with 96:4 chloroform/methanol to give recovered starting material and the stated product (6.6 mg). MS, m/z(M+)=618.2237.

Provenance & Evidence