Dichloromethane → Ethyl 3-(5-amino-2-(4-(2-(3-(diethoxyphosphoryl)-3,3-difluoropropoxy)ethoxy)-2-methylphenethyl)benzo[f][1,7]naphthyridin-8-yl)propanoate

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 3-(5-amino-2-(4-hydroxy-2-methylphenethyl)benzo[f][1,7]naphthyridin-8-yl)propanoate (6-13) (1.0 equiv.) dissolved in DMF (0.14 M) was added a solution of diethyl 3-(2-bromoethoxy)-1,1-difluoropropylphosphonate (6-14: described in Example 7—Step 1) (1.3 equiv.) in DMF (0.7 M) and cesium carbonate (4 equiv.). The reaction was stirred at 60° C. After 1.5 hours (or until reaction is complete by LCMS), DCM (2 volume equivalent) was added to the reaction. The solids (inorganic) were filtered, and the filtrate was concentration. The crude product was purified by Combiflash using 0-5% MeOH in DCM to give ethyl 3-(5-amino-2-(4-(2-(3-(diethoxyphosphoryl)-3,3-difluoropropoxy)ethoxy)-2-methylphenethyl)benzo[f][1,7]naphthyridin-8-yl)propanoate (6-15) as an oil which upon standing became a white solid.

Provenance & Evidence