反应详情

To a solution of 4.5 g (23.4 mmol) of 6,7-dihydro-5H-cyclopentapyrazine-6 carboxylic acid ethyl ester (prepared by analogy to the method described in WO99/02517) in 90 ml of anhydrous tetrahydrofuran under argon was added 1.33 g (35.1 mmol) of lithium aluminium hydride. The resulting mixture was stirred at room temperature for 2 h. The reaction mixture was diluted with 100 ml of diethylether at 0° C. and treated with excess of a saturated aqueous solution of sodium sulfate. Further solid sodium sulfate was added and the organic phase was filtered to remove salts. The solvent was evaporated to dryness to give 3.3 g (94%) of product as an oil.

1. filtrationthe organic phase was filtered
2. customto remove salts
3. customThe solvent was evaporated to dryness