Triethylamine → Benzyl(3S,4S)-3-[(tert-butoxycarbonyl)amino]-4-{[(methylsulfonyl)oxy]methyl}-1-pyrrolidinecarboxylate

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Reaction Steps

The product of Example 52B (43.7 g, 125 mmol) and triethylamine (25.2 g, 250 mmol) in CH2Cl2 (600 mL) was treated with methanesulfonyl chloride (12.6 mL, 163 mmol) over 30 minutes at −10° C. The solution was allowed to warm to room temperature over 1 hour and then quenched with water (100 mL). The layers were separated and the aqueous phase was extracted with CH2Cl2 (2×400 mL). The combined organic phases were washed with brine (2×100 mL), dried over Na2SO4, filtered and the filtrate concentrated to provide the title compound as a brown dark brown oil (52.0 g, yield, 97%). 1H NMR (CDCl3, 300 MHz) δ 1.46 (s, 9H), 2.80 (m, 1H), 3.08 (s, 3H), 3.40 (m, 2H), 3.70 (m, 2H), 4.10 (m, 1H), 4.40 (m, 2H), 4.75 (m, 1H), 5.16 (s, 2H), 7.30 m, 5H); MS (DCI/NH3) m/z 446 (M+NH4)+, 429 (M+H)+.

Provenance & Evidence