反应详情

温度

85 °C

To a suspension of 2-fluoro-5-(4-oxo-3,4,5,6,7,8-hexahydro-phthalazin-1-ylmethyl)benzoic acid (11) (0.50 g, 1.650 mmol), in acetonitrile (2.5 ml) was added triethylamine (0.46 ml, 3.31 mmol) the suspension dissolved to afford a brown solution which was subsequently heated to 85° C. D/L alanine methyl ester hydrochloride (2.30 g, 1.650 mmol) dissolved in acetonitrile (5 ml) and N-methylpyrrolidinone (0.5 ml) was added simultaneously to the reaction mixture with diphenylphosphinic azide (0.357 ml, 1.650 mmol). After 40 minutes of heating the reaction mixture was cooled to ambient temperature and concentrated to vacuo. The crude oil was then subjected to flash chromatography, eluent hexane/ethyl acetate, 7:13 (Rf=0.14). Single peak in LC-MS, (0.67 g, 98% purity); m/z (LC-MS, ESP), RT=3.37 mins (M+H 403.2).

1. dissolutiondissolved
2. customto afford a brown solution which
3. temperatureAfter 40 minutes of heating the reaction mixture
4. temperaturewas cooled to ambient temperature
5. concentrationconcentrated to vacuo