Diethyl Ether → HCID 11219222, compound

Participants

Reaction Conditions

Reaction Steps

A sealed glass tube containing 2-(ethoxymethyl)-1-(2-methylpropyl)-6-methyl-4-phenoxy-1H-imidazo[4,5-c]pyridine (2.51 g) from Part E and ammonium acetate (25.1 g) was heated to 150° C. After 36 hours, TLC monitoring indicated that the reaction was complete. The resulting reaction mixture was cooled and then dissolved in ethyl acetate. The ethyl acetate solution was washed with 25% aqueous sodium hydroxide. The resulting organic layer was dried with magnesium sulfate, and concentrated under reduced pressure to an orange oil. The oil was put through a column using 95/5 ethyl acetate/methanol, providing good separation. The oil recovered from the product fraction was dissolved in isopropyl alcohol, to which 1M HCl in diethyl ether was added. A white solid formed. More diethyl ether was added, and the white solid was filtered and dried under vacuum at 80° C. for 5 hours. The resulting solid was dissolved in water (50 ml), and the pH was adjusted to 11 using sodium carbonate. An oil separated and was extracted with dichloromethane. The resulting dichloromethane solution was dried with magnesium sulfate and concentrated under reduced pressure to a clear oil. The oil was triturated with methanol, and the resulting solid was dissolved in diethyl ether. The diethyl ether solution was subjected to high vacuum at room temperature to dry the product. The resulting partially solidified product was solidified by cooling with an isopropyl alcohol/dry ice bath to provide 2-(ethoxymethyl)-1-(2-methylpropyl)-6-methyl-1H-imidazo[4,5-c]pyridin-4-amine, m.p. 77.0-79.0° C.

Provenance & Evidence