Trifluoroacetic anhydride → HCID 59380350, Verbindung

Methyl [4-chloro-6-[(2,2-dimethoxyethyl)amino]-2-(4-nitrobenzyl)pyrimidin-5-yl]acetate (100 mg, 0.19 mmol) was treated with 50% trifluoroacetic acid/dichloromethane (5 mL) at room temperature overnight. The mixture was poured into water and extracted with dichloromethane. The extracts were washed with aq NaHCO3 and brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The crude product was dissolved in dichloromethane (5 mL). To the solution was added trifluoroacetic anhydride (0.053 mL, 0.38 mmol). The mixture was stirred at room temperature for 3 hours. The mixture was poured into water and extracted with dichloromethane. The extracts were washed with aq NaHCO3 and brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The crude product was purified by preparative TLC (silica gel, chloroform:ethanol, 19/1) to give methyl [7-chloro-5-(4-nitrobenzyl)imidazo[1,2-c]pyrimidin-8-yl]acetate (22 mg, 25%) as a colorless film.