N-Iodosuccinimide → N4-(Cyclopropylmethyl)-5-iodopyrimidine-2,4-diamine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

N-iodosuccinimide (11.5 g, 50.9 mmol) was added to a solution of compound 237 (7.60 g, 46.3 mmol) in AcOH (90 mL). The reaction was warmed to 80° C. and stirred for 1.5 h. Solvent was removed in vacuo. The residue was taken up in dichloromethane (200 mL) and water. The aqueous layer was brought to pH 12 with 5 N NaOH and organics were sequestered. The aqueous was extracted further with dichloromethane (2×100 mL). The combined organics were treated with solid sodium thiosulfate, dried with MgSO4 and concentrated in vacuo. Silica gel chromatography (gradient elution 10 to 75% ethyl acetate in hexanes) afforded compound 238 (8.0 g, 60% yield).

Herkunft & Nachweise