反应详情

2-(4-methoxy-2-methylphenethyl)-8-methylbenzo[f][1,7]naphthyridin-5-amine was prepared from 2-((4-methoxy-2-methylphenyl)ethynyl)-8-methylbenzo[f][1,7]naphthyridin-5-amine (from the previous step). To a round bottom flask was added 2-((4-methoxy-2-methylphenyl)ethynyl)-8-methylbenzo[f][1,7]naphthyridin-5-amine (1 eq.) with a stirring bar. Ethanol and methylene chloride (1:2, 0.2 M) were added, followed by palladium in carbon (activated powder, wet, 10% on carbon, 0.1 eq.). The content was degassed (vacuum) followed by hydrogen flush (three times). The reaction mixture was stirred vigorously at room temperature overnight, under a hydrogen balloon. Afterwards the reaction mixture was filtered through a celite pad, and the celite pad was washed subsequently with methylene chloride and EtOAc until the filtrate had no UV absorption. Combined organic washes were concentrated. Flash chromatography (silica gel, 0-50% EtOAc in CH2Cl2) afforded the product 2-(4-methoxy-2-methylphenethyl)-8-methylbenzo[f][1,7]naphthyridin-5-amine. 1H NMR (CDCl3): δ 8.53 (d, 1H), 8.29 (d, 1H), 8.01 (d, 1H), 7.44 (s, 1H), 7.12 (dd, 1H), 6.93 (d, 1H), 6.67 (d, 1H), 6.60 (dd, 1H), 5.93 (bs, 2H), 3.70 (s, 3H), 3.05-3.00 (dd, 2H), 2.93-2.88 (dd, 2H), 2.44 (s, 3H), 2.19 (s, 3H). LRMS [M+H]=358.2

1. customThe content was degassed (vacuum)
2. customflush (three times)
3. filtrationAfterwards the reaction mixture was filtered through a celite pad
4. washthe celite pad was washed subsequently with methylene chloride and EtOAc until the filtrate
5. customno UV absorption
6. concentrationCombined organic washes were concentrated