methyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-(quinolin-6-yl)propanoate → methyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-(1,2,3,4-tetrahydroquinolin-6-yl)propanoate

Participants

Reaction Steps

A suspension of #213 (1.5 g, 4.55 mmol, 1 eq.) and palladium on carbon (150 mg) in ethanol (20 mL) was stirred at 50° C. under 30 psi of hydrogen overnight. The reaction mixture was filtered through a pad of celite and the filtrate was concentrated in vacuo. The residue was purified by silica column chromatography (Gradient: 40% ethyl acetate in petroleum ether) to afford #214 (1.2 g, 80%) as an oil. 1H NMR (400 MHz, CDCl3): δ 6.70 (d, 2H), 6.40 (m, 1H), 4.95 (m, 1H), 4.49 (m, 1H), 3.77 (s, 3H), 3.28 (m, 2H), 2.97 (m, 2H), 2.71 (m, 2H), 1.95 (m, 2H), 1.26 (s, 9H), HPLC (Protocol Y): m/z 357.0 [M+Na+] retention time=5.304 minutes (purity >98%). Chiral HPLC retention time: 4.64 min (purity=98%)(Column: Chiralcel OJ-H, 150×4.6 mm, 5 μm; Mobile phase: ethanol (0.05% diethylamine) in CO2 from 5% to 40% over 15 minutes; Flow rate: 2.5 mL/minute.

Provenance & Evidence