Acetic Acid → HCID 86641982, compound

Participants

Reaction Steps

(S)-tert-Butyl 2-amino-4-methylpentanoate hydrochloride (1.022 g, 4.57 mmol) and pivalaldehyde (0.502 mL, 4.57 mmol) were combined in dichloromethane (25 mL). Acetic acid (1.0 mL) was added. The reaction was stirred at room temperature for 5 minutes, then PS-cyanoborohydride (3.90 g, 9.14 mmol) was added. The reaction was stirred at room temperature overnight, then filtered and the solvent was removed in vacuo. The crude material was diluted with dichloromethane and basified using saturated aqueous sodium bicarbonate to give (S)-tert-butyl 4-methyl-2-(neopentylamino)pentanoate: 1H NMR (300 MHz, CDCl3) δ ppm 3.04 (t, J=7.4, 1H), 2.40 (d, J=11.1, 1H), 2.09 (d, J=11.1, 1H), 1.86-1.70 (m, 1H), 1.46 (s, 10H), 1.40 (t, J=7.2, 3H), 0.95-0.89 (m, 6H), 0.89 (s, 9H). (S)-tert-butyl 4-methyl-2-(neopentylamino)pentanoate was dissolved in 10 mL of 4 N HCl in dioxane and stirred at room temperature overnight. The solvent was removed under a stream of nitrogen and under high vacuum to give (S)-4-methyl-2-(neopentylamino)pentanoic acid: 1H NMR (300 MHz, DMSO-d6) δ ppm 8.89-8.37 (m, 1H), 8.34-8.03 (m, 1H), 3.82 (t, J=6.5, 1H), 2.88 (d, J=12.3, 1H), 2.62 (d, J=12.2, 1H), 1.83-1.67 (m, 2H), 1.67-1.56 (m, 1H), 1.00 (s, 9H), 0.97-0.88 (m, 6H).

Provenance & Evidence