HCID 11255392, Verbindung → Benzyl 2-[(pyridin-4-yl)oxy]propanoate

Temperatur

60 °C

To a solution of benzyl lactate (6.0 g, 33 mmol) and N-methyl morpholine (2.7 mL, 33 mmol) in 100 mL of anhydrous methylene chloride at −20° C. was added trifluoromethanesulfonyl anhydride (5.6 mL, 33 mmol). After stirring at −20° C. for 1 h, the reaction mixture was diluted with 100 mL of hexane and washed with dilute aqueous sodium hydrogen sulfate and brine/saturated aqueous sodium bicarbonate. The organic layer was separated, dried over anhydrous magnesium sulfate, filtered, and concentrated to dryness, and the residue was purified by flash column chromatography on silica gel eluted with 10% ether in hexane to give benzyl 2-trifluoromethanesulfonyloxypropionate (6.4 g), which was used immediately for the ensuing reaction. Thus, a mixture of N-trimethylsilylethoxymethyl-4-pyridone (Step A, 3.4 g, 15 mmol) and benzyl 2-trifluromethanesulfonyloxypropionate (4.7 g, 15 mmol) was heated at 60° C. overnight. After cooling to room temperature, the reaction mixture was dissolved in methylene chloride and loaded onto a silica gel column, which was eluted with 5% methanol in methylene chloride to give the title compound. 1H NMR (500 MHz, CD3OD): δ 8.57 (d, 2H), 7.42 (d, 2H), 7.4-7.3 (n, 5H), 5.44 (q, 1H), 5.24 (ABq, 2H), 1.72 (d, 3H). LC-MS: m/e 258 (M+H)+ (1.8 min).

1. customwas used immediately for the ensuing reaction
2. temperatureAfter cooling to room temperature
3. washwas eluted with 5% methanol in methylene chloride

ORD-Eintrag

ord-8119bbff66e447fcaa46cda3e60f5132

Quelldatensatz

uspto-grants-2008_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07348456B2