HCID 86641981, compound → L-Leucine, N-(methylsulfonyl)-

Participants

Reaction Steps

(S)-tert-Butyl 2-amino-4-methylpentanoate hydrochloride (1.53 g, 6.84 mmol) was dissolved in dichloromethane and triethylamine (3.15 mL, 22.57 mmol). Methanesulfonyl chloride (0.638 mL, 8.21 mmol) was added dropwise, and the reaction stirred at room temperature for 1 hour. The reaction was quenched with saturated aqueous NaHCO3 and extracted with dichloromethane (3×50 mL). The solvent was removed in vacuo to give (S)-tert-butyl 4-methyl-2-(methylsulfonamido)pentanoate: 1H NMR (300 MHz, CDCl3) δ ppm 4.71 (d, J=9.7, 1H), 3.98 (td, J=9.5, 5.5, 1H), 2.92 (s, 3H), 1.84 (dt, J=13.1, 6.6, 1H), 1.54 (s, 9H), 1.44-1.48 br s, 1H), 0.96 (dd, J=6.6, 2.4, 6H); MS (ESI−) m/z 264 (M−H)−. (S)-tert-Butyl 4-methyl-2-(methylsulfonamido)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-(methylsulfonamido)pentanoic acid: 1H NMR (300 MHz, CDCl3) δ ppm 4.86 (d, J=9.6, 1H), 4.17 (td, J=9.6, 4.8, 1H), 3.18-3.07 (m, 1H), 2.99 (s, 3H), 1.96-1.80 (m, 1H), 1.64 (dddd, J=23.4, 13.9, 9.1, 5.0, 2H), 1.40 (t, J=7.3, 1H), 0.98 (dd, J=6.6, 3.3, 6H).

Provenance & Evidence