反应详情

Hydroxy-acetic acid ethyl ester (3.7 g, 36 mmol) is added to a suspension of 60% NaH (1.5 g, 37 mmol) in DMF (70 ml) at 0° C. and the mixture is stirred at room temperature for 15 min. Then 3-bromo-5-chloromethyl-pyridine (3.0 g, 15 mmol) is added to the mixture at 0° C. and the mixture is stirred at room temperature for 16 hrs. The reaction is quenched with saturated. NH4Cl aqueous solution, extracted with EtOAc three times. The organic layers are combined, washed with water and brine, dried over Na2SO4 and concentrated. The residue is purified by flash column chromatography to give 1.6 g of (5-bromo-pyridin-3-ylmethoxy)-acetic acid ethyl ester. 1.0 M MeMgBr (7.5 mL, 7.5 mmol) is added dropwise to a solution of (5-bromo-pyridin-3-ylmethoxy)-acetic acid ethyl ester (1.6 g, 5.9 mmol) in THF (54 mL) at 0° C. The mixture is stirred at room temperature for 16 hrs. Then the mixture is diluted with EtOAc and washed with water and brine. The organic layer is separated, dried over Na2SO4 and concentrated. The residue is purified by flash column chromatography to give 600 mg of 1-(5-bromo-pyridin-3-ylmethoxy)-2-methyl-propan-2-ol. It is then converted to 6-[5-(2-hydroxy-2-methyl-propoxymethyl)-pyridin-3-yl]-3,4-dihydro-2H-[1,8]naphthyridine-1-carboxylic acid tert-butyl ester according to the procedure of Suzuki Coupling Method IV.

1. stirringthe mixture is stirred at room temperature for 16 hrs
2. customThe reaction is quenched with saturated
3. extractionNH4Cl aqueous solution, extracted with EtOAc three times
4. washwashed with water and brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. customThe residue is purified by flash column chromatography