Ethyl 3-(5-amino-2-((4-(methoxymethoxy)-2-methylphenyl)ethynyl)-benzo[f][1,7]naphthyridin-8-yl)propanoate → Ethyl 3-(5-amino-2-(4-(methoxymethoxy)-2-methylphenethyl)benzo[f][1,7]naphthyridin-8-yl)propanoate

Participants

Reaction Steps

A solution of ethyl 3-(5-amino-2-((4-(methoxymethoxy)-2-methylphenyl)ethynyl)-benzo[f][1,7]naphthyridin-8-yl)propanoate (11) (1.0 equiv.) in EtOH/THF (3:1, 0.16M) was flushed with nitrogen. Then, 10% wt Pd/C (0.20 equiv. by weight) was added. The reaction was flushed with hydrogen (2×) and stirred under a hydrogen balloon. After 24 hours, the reaction was filtered through a pad of celite, washing with 5% MeOH in DCM. The filtrate was checked for the presence of starting material using LCMS. The hydrogenation reaction was repeated until no more of the alkyne starting material or alkene intermediate was detected. The crude product was purified by Combiflash using 0-4% MeOH in DCM to give ethyl 3-(5-amino-2-(4-(methoxymethoxy)-2-methylphenethyl)benzo[f][1,7]naphthyridin-8-yl)propanoate (12) as a white solid.

Provenance & Evidence