PMC:7571312 / 67285-68238 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":"A solution of tert-butyl ((1S)-3-bromo-2-oxo-1-{[(3S)-2-oxopyrrolidin-3-yl]methyl}propyl)carbamate (1.17 g, 3.2 mmol) in DMF (16 mL) was treated with 2,6-dichlorobenzoic acid (794 mg, 4.2 mmol) followed by cesium fluoride (1.18 g, 7.4 mmol). The resulting suspension was placed in a preheated oil bath at 65 °C for 2 h. The reaction was cooled to an ambient temperature, diluted with ethyl acetate (100 mL), washed once with water (40 mL) and with brine (40 mL), dried over MgSO4, filtered, and concentrated to give a crude yellow syrup. This material was purified by Biotage MPLC (25 M, 4.5% methanol/dichloromethane) to afford 1.19 mg (80%) of the title compound as an off-white glass. 1H NMR (400 MHz, DMSO-d6) δ 7.60 (m, 5H), 5.35 (s, 2H), 4.32 (m, 1H), 3.23 (m, 2H), 2.24 (m, 1H), 2.11 (m, 1H), 1.86 (m, 1H), 1.67 (m, 2H), 1.35 (s, 9H); MS (ESI+) for C20H24Cl2N2O6m/z 481.0 (M + Na)+; HRMS (ESI+) calcd for C20H24Cl2N2O6+H 481.0903, found 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