PMC:7291971 / 37791-38794 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7291971","sourcedb":"PMC","sourceid":"7291971","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7291971","text":"Following method B using 18 (290 mg, 0.59 mmol, 1.00 eq), 19 (450 mg, 74%) was obtained as a pale yellow solid. Rf 0.60 (10:90 MeOH/DCM). 1H NMR (600 MHz, CDCl3) δ 8.30 (2s, 2H), 8.14 (s, 1H), 8.03–7.98 (m, 2H), 7.74 (s, 1H), 7.70–7.66 (m, 2H), 6.11–5.93 (m, 5H), 5.89 (d, J = 1.9 Hz, 1H), 5.35 (dd, J = 6.4 Hz, J = 1.9 Hz, 1H), 5.04 (dd, J = 6.4 Hz, J = 3.8 Hz, 1H), 4.51 (dd, J = 6.1 Hz, J = 4.6 Hz, 1H), 4.43 (dt, J = 8.5 Hz, J = 4.2 Hz, 1H), 4.22 (dd, J = 4.7 Hz, J = 3.2 Hz, 1H), 4.05 (dt, J = 5.9 Hz, J = 3.0 Hz, 1H), 3.99 (dd, J = 11.5 Hz, J = 3.5 Hz, 1H), 3.85–3.41 (m, 7H), 1.57 (s, 3H), 1.35 (s, 3H), 0.92 (s, 9H), 0.91 (s, 9H), 0.14–0.04 (m, 12H). 13C NMR (150 MHz, CDCl3) δ 155.8, 155.5, 153.2, 153.0, 149.7, 149.5, 148.9, 145.4, 140.2, 139.5, 128.4, 123.8, 120.5, 120.2, 114.7, 90.7, 87.3, 85.0, 84.5, 84.2, 82.8, 82.6, 69.7, 69.6, 61.5, 50.7, 47.7, 27.3, 26.2, 25.9, 25.4, 18.6, 18.2, −4.4, −4.7, −5.2, −5.3. HRMS (ESI+): m/z calcd for C43H65N12O11SSi2 [M+H]+: 1013.4155, found: 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