3-(Aminomethyl)benzeneboronic acid, N-BOC protected → tert-butyl {3-[4-amino-2-ethoxymethyl-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]benzyl}carbamate

Participants

Reaction Steps

1-(4-Amino-7-bromo-2-ethoxymethyl-1H-imidazo[4,5-c]quinolin-1-yl)-2-methylpropan-2-ol (2.62 g, 6.67 mmol) and 3-(N-tert-butoxycarbonylaminomethyl)phenylboronic acid (2.0 g, 8.0 mmol) were coupled according to the procedure described in Part J of Example 1. Palladium (II) acetate was added as a 5 mg/mL solution in toluene. The reaction was heated for four hours, and the work-up procedure described in Examples 125-135 was followed. The crude product was purified by HPFC (eluting with chloroform:CMA in a gradient from 100:0 to 80:20) to provide 2.94 g of tert-butyl {3-[4-amino-2-ethoxymethyl-1-(2-hydroxy-2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-yl]benzyl}carbamate as a white solid.

Provenance & Evidence