反应详情

Quinuclidine-3-carboxylic acid hydrochloride (160 mg, 0.83 mmol), EDC (290 mg, 1.51 mmol), and HOBT (232 mg, 1.51 mmol) were dissolved in dry DMF (8 ml). 1,2-Diphenylethanol (150 mg, 0.76 mmol) and TEA (0.32 ml, 2.27 mmol) were added, and the resulting mixture was stirred at room temperature overnight. Then quinuclidine-3-carboxylic acid hydrochloride (72.5 mg, 0.38 mmol), EDC (87 mg, 0.45 mmol), and HOBT (57.9 mg, 0.38 mmol) were added followed by TEA (0.16 ml, 1.13 mmol), and the mixture was stirred for additional 32 hours. The mixture was diluted with water and extracted three times with Et2O. The organic phases were collected, washed with brine, dried over Na2SO4, filtered, and evaporated to dryness. The crude residue was purified by flash chromatography (DCM/MeOH=9/1) to obtain 1,2-diphenylethyl quinuclidine-3-carboxylate (136 mg, racemic mixture).

1. stirringthe mixture was stirred for additional 32 hours
2. extractionextracted three times with Et2O
3. customThe organic phases were collected
4. washwashed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. customevaporated to dryness
8. customThe crude residue was purified by flash chromatography (DCM/MeOH=9/1)