PMC:7571312 / 115766-116672 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":"Following the procedure described for the preparation of N-((1S)-1-{[((1S)-3-chloro-2-oxo-1-{[(3S)-2-oxopyrrolidin-3-yl]methyl}propyl)amino]carbonyl}-3-methylbutyl)-4-methoxy-1H-indole-2-carboxamide but substituting indole-2-carboxylic acid and making noncritical variations provided a crude orange foam. This material was purified by Biotage flash chromatography, eluting with methanol/dichloromethane to afford the title compound as an off-white solid, 1.75 g, 82%. 1H NMR (400 MHz, DMSO-d6) δ 11.58 (s, 1H), 8.64 (d, J = 7.8 Hz, 1H), 8.50 (d, J = 7.8 Hz, 1H), 7.55–7.69 (m, 2H), 7.42 (d, J = 8.3 Hz, 1H), 7.26 (d, J = 1.5 Hz, 1H), 7.16 (m, 1H), 7.02 (t, J = 7.5 Hz, 1H), 4.53–4.66 (m, 2H), 4.39–4.52 (m, 2H), 2.94–3.18 (m, 2H), 2.22–2.35 (m, 1H), 2.03–2.16 (m, 1H), 1.89–2.02 (m, 1H), 1.45–1.82 (m, 5H), 0.93 (d, J = 6.3 Hz, 3H), 0.88 (d, J = 6.3 Hz, 3H); MS (APCI−) for C23H29N4O4Cl m/z 459.1 (M – 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