PMC:7571312 / 40032-41712 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7571312","sourcedb":"PMC","sourceid":"7571312","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7571312","text":"tert-Butyl ((1S)-3-Chloro-2-oxo-1-{[(3S)-2-oxopyrrolidin-3-yl]methyl}propyl)carbamate (8)\nA three-neck flame-dried flask equipped with a nitrogen inlet and internal thermometer was charged with methyl N-(tert-butoxycarbonyl)-3-[(3S)-2-oxopyrrolidin-3-yl]-l-alaninate (10 g, 35 mmol), THF (200 mL), and chloroiodomethane (10.2 mL, 140 mmol), and the solution was cooled to −77 °C. LDA (140 mL, 210 mmol, 1.5 M mono-THF complex in cyclohexane) was added via a pressure-equalizing dropping funnel at such a rate to keep the internal temperature below −70 °C. After complete addition, the reaction was stirred for an additional hour and quenched with a mixture of AcOH (33 mL) and THF (200 mL) with a rate of addition regulated to maintain the internal temperature below −65 °C. After complete addition, the dark suspension was stirred for 10 min and then warmed to an ambient temperature. The reaction was diluted with ethyl acetate (500 mL), and the organics were washed with water (250 mL), satd. NaHCO3 (250 mL), and brine (250 mL), dried over MgSO4, filtered, and the solvents were removed in vacuo to yield the crude product as a dark oil, which was purified by flash chromatography eluting with ethyl acetate. The resulting solid was triturated with diethyl ether to afford the title compound as a pale yellow solid, 5.7 g, 54%. 1H NMR (400 MHz, DMSO-d6) δ 7.88 (s, 1H), 7.75 (d, J = 7.6 Hz, 1H), 4.73–4.94 (m, 2H), 4.37 (m, 1H), 3.28–3.43 (m, 2H), 2.46 (m, 1H), 2.30–2.40 (m, 1H), 2.02–2.14 (m, 1H), 1.77–1.95 (m, 2H), 1.60 (s, 9H); MS (API-ES+) for C13H21N2O4Cl m/z 327.1 (M + Na)+; anal. calcd for C13H21ClN2O4: C, 51.23; H, 6.95; N, 9.19. Found: C, 51.03; H, 6.93; N, 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