反应详情

A solution of N-Boc nortropinone (2.4 g, 10.9 mmol) and methyl 4-aminomethylbenzoate (1.6 g, 10.9 mmol) in dichloroethane (20 mL) was stirred as acetic acid (0.85 g, 14.2 mmol) was added. After 1 hour, sodium triacetoxyborohydride (2.7 g, 13.1 mmol) was added and the reaction was stirred for 17 hours. The reaction was treated with a saturated aqueous solution of sodium bicarbonate and extracted with ethyl acetate (2×). The combined organic extracts were dried and concentrated. Purification by flash chromatography on silica gel using a gradient of ethyl acetate in hexane gave 3.6 g of 1,1-dimethylethyl 3-[[[4-(methoxycarbonyl)phenyl]methyl]amino]-8-azabicyclo[3.2.1]octane-8-carboxylate.

1. additionwas added
2. extractionextracted with ethyl acetate (2×)
3. customThe combined organic extracts were dried
4. concentrationconcentrated
5. customPurification by flash chromatography on silica gel using a gradient of ethyl acetate in hexane