PMC:7291971 / 79477-81147 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":"To a solution of 20 (210 mg, 0.25 mmol, 1.00 eq) in anhydrous DCE (7 mL) was added 4-chlorobenzaldehyde (43 mg, 0.38 mmol, 1.50 eq) in anhydrous DCE (7 mL) and acetic acid (18 μL, 0.38 mmol, 1.50 eq). After stirring for 20 min at 40 °C under argon, sodium triacetoxyborohydride (81 mg, 0.38 mmol, 1.50 eq) was added. After stirring at 40 °C for 16 h, the solution was diluted with DCM (50 mL) and washed with saturated aqueous NaHCO3. The aqueous layer was extracted with DCM (3 × 50 mL) and the combined organic extracts were washed with brine (70 mL), dried over Na2SO4 and concentrated under vacuum. The residue was purified by flash column chromatography (silica gel, linear gradient 0–5% MeOH in DCM) to give 36 as a white solid (172 mg, 0.18 mmol, 72%). Rf 0.71 (MeOH/CH2Cl2 5:95). 1H NMR (600 MHz, CDCl3) δ 8.30 (s, 1H), 8.20 (s, 1H), 8.15 (s, 1H), 7.83 (s, 1H), 7.19–7.07 (m, 4H), 6.11 (d, J = 3.7 Hz, 1H), 5.99 (d, J = 2.2 Hz, 1H), 5.97–5.83 (m, 4H), 5.37 (dd, J = 6.5 Hz, J = 2.2 Hz, 1H), 4.85 (dd, J = 6.4 Hz, J = 3.4 Hz, 1H), 4.49 (t, J = 5.1 Hz, 1H), 4.32 (td, J = 6.7 Hz, J = 3.3 Hz, 1H), 4.26 (t, J = 4.2 Hz, 1H), 4.08 (dt, J = 5.9 Hz, J = 3.1 Hz, 1H), 3.98 (dd, J = 11.5 Hz, J = 3.6 Hz, 1H), 3.79–3.47 (m, 5H), 2.84–2.66 (m, 4H), 1.58 (s, 3H), 1.36 (s, 3H), 0.92 (s, 9H), 0.88 (s, 9H), 0.13–0.02 (m, 12H). 13C NMR (150 MHz, CDCl3) δ 155.7, 155.6, 153.1, 153.1, 149.7, 149.3, 140.0, 139.5, 137.8, 132.8, 130.1, 128.4, 120.5, 120.3, 114.4, 91.0, 87.2, 85.7, 84.9, 84.0, 83.5, 82.7, 69.8, 69.5, 61.3, 58.6, 56.4, 53.6, 27.3, 26.2, 25.9, 25.5, 18.6, 18.2, −4.5, −4.7, −5.2, −5.3. HRMS (ESI+): m/z calcd for C44H67N11O7Si2Cl [M+H]+: 952.4447, found: 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