反应详情

To 82 mg (0.28 mmol) of 1-benzyloxycarbonyl-4-(methoxycarbonylamino)piperidine from Step A and 0.045 mL (0.56 mmol) of ethyl iodide in 4 mL of DMF under nitrogen was added 22 mg (0.56 mmol) of 60% sodium hydride in mineral oil. The reaction was stirred at rt for 1 h and was then poured into water containing 1 mL of 2 N hydrochloric acid and extracted twice with ether. The organic layers were each washed with a portion of brine, dried over sodium sulfate, combined and concentrated. The residue was purified by FCC eluting with 50% ethyl acetate/hexanes to afford 87 mg of title compound. 1H NMR (400 MHz, CDCl3): δ 1.07 (t, J=7, 3H), 1.5-1.8 (m, 4H), 2.79 (m, 2H), 3.15 (m, 2H), 3.68 (s, 3H), 4.10 (m, 1H), 4.26 (m, 2H), 5.10 (s, 2H), 7.34 (m, 5H).

1. extractionextracted twice with ether
2. washeach washed with a portion of brine
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated
5. customThe residue was purified by FCC
6. washeluting with 50% ethyl acetate/hexanes