tert-butyl N-(1-hydroxy-4-methylsulfanylbutan-2-yl)carbamate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of tert-butyl [1-hydroxy-4-(methylsulfanyl)butan-2-yl]carbamate (18.5 g, 84.5 mmol) in THF (400 mL) was added phthalimide (14.9 g, 0.101 mol) and triphenylphosphine (26.9 g, 0.101 mol) under a nitrogen atmosphere. Diethylazodicarboxylate (27.3 g, 0.135 mol) was added dropwise at room temperature. After 2 hours, the reaction mixture was concentrated under reduced pressure, and the residue was purified by chromatography on silica gel to give tert-butyl {1-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-4-(methylsulfanyl)butan-2-yl}carbamate. MS ESI calc'd. for C18H25N2O4S [M+H]+ 365. found 365. 1H NMR (400 MHz, CDCl3) δ 7.87-7.71 (m, 4H), 4.72 (s, 1H), 4.16-4.07 (m, 1H), 3.76 (d, J=6.6 Hz, 2H), 2.68-2.54 (m, 2H), 2.13 (s, 3H), 1.75-1.55 (m, 2H), 1.35 (s, 9H). the reaction mixture was concentrated under reduced pressure the residue was purified by chromatography on silica gel

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of methyl N-(tert-butoxycarbonyl)methioninate (47.7 g, 0.181 mol) in THF (500 mL) was added lithium borohydride (16.0 g, 0.734 mol) at 0° C. The reaction mixture was allowed to warm to room temperature. After 2 hours, the reaction mixture was diluted with saturated aqueous ammonium chloride solution and extracted with ethyl acetate. The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure to give tert-butyl [1-hydroxy-4-(methylsulfanyl)butan-2-yl]carbamate. MS ESI calc'd. for C10H22NO3S [M+H]+ 236. found 236. 1H NMR (400 MHz, CD3OD) δ 3.68-3.64 (m, 1H), 3.54-3.47 (m, 2H), 2.59-2.48 (m, 2H), 2.10 (s, 3H), 1.88-1.64 (m, 2H), 1.49 (s, 9H). extracted with ethyl acetate The combined organic layers were washed with brine dried over sodium sulfate filtered concentrated under reduced pressure