3-(1,3,2-Dioxaborinan-2-yl)pyridine → 2-ethoxymethyl-1-{2-[2-(methanesulfonyl)ethoxy]-2-methylpropyl}-7-(pyridin-3-yl)-1H-imidazo[4,5-c]quinolin-4-amine

Participants

Reaction Steps

7-Bromo-2-ethoxymethyl-1-{2-[2-(methanesulfonyl)ethoxy]-2-methylpropyl}-1H-imidazo[4,5-c]quinolin-4-amine (1.2 g, 2.4 mmol) and pyridine-3-boronic acid 1,3-propanediol cyclic ester (0.47 g, 2.9 mmol) were coupled according to the method described in Part J of Example 1. The work-up procedure used in Part F of Examples 125-135 was followed. The crude product was purified by column chromatography on silica gel (eluting sequentially with 95:5 and 90:10 dichloromethane:methanol) followed by recrystallization from acetonitrile (52 mL/g). The crystals were isolated by filtration, washed with acetonitrile, and dried for four hours under vacuum at 65° C. to provide 0.70 g of 2-ethoxymethyl-1-{2-[2-(methanesulfonyl)ethoxy]-2-methylpropyl}-7-(pyridin-3-yl)-1H-imidazo[4,5-c]quinolin-4-amine as white, crystalline plates, mp 202-204° C.

Provenance & Evidence