反应详情

A suspension of (R,E)-ethyl 5-(tert-butoxycarbonylamino)hex-2-enoate (1.70 g, 6.61 mmol) and 5% Pd/C (350 mg) in ethanol (35 mL) was vigorously stirred under the atmosphere of hydrogen balloon for 1.5 hr. The reaction mixture was filtered and the filtrate were concentrated to give (R)-ethyl 5-(tert-butoxycarbonylamino)hexanoate (1.71 g, 6.58 mmol, 100% yield) as a colorless oil. 1H NMR (400 MHz, CDCl3) δ ppm 4.34 (s, 1H), 4.12 (q, J=7.1 Hz, 2H), 3.66 (s, 1H), 2.31 (td, J=7.5, 1.6 Hz, 2H), 1.75-1.57 (m, 2H), 1.51-1.38 (m, 2H), 1.44 (s, 9H), 1.25 (t, J=7.1 Hz, 3H), 1.12 (d, J=6.6 Hz, 3H).

1. filtrationThe reaction mixture was filtered
2. concentrationthe filtrate were concentrated