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DOI: 10.1055/a-2066-0860
Practical and Scalable Total Syntheses of (+)-Dysidavarones A–C
This work was financially supported by the National Natural Science Foundation of China (Nos. 22171146, 21971121, and 22188101 to Z.L.) and the China Postdoctoral Science Foundation (No. 2021M701775 to C.C.).
Abstract
A practical and scalable enantioselective total syntheses of the marine anticancer sesquiterpene quinone meroterpenoids (+)-dysidavarones A–C has been accomplished. The central bridged bicyclo[3.3.1]nonane structure of dysidavarones was efficiently established by a one-pot intermolecular diastereoselective alkylation and intramolecular α-arylation of a Wieland–Miescher ketone derivative with a substituted benzylic bromide, without protection of the more-reactive C(4) carbonyl group. (+)-Dysidavarones A and ‘E’ were prepared on a 150-mg scale, demonstrating the efficiency and reliability of our synthetic route and providing sufficient amounts of the dysidavarones for further bioactivity evaluation.
Key words
total synthesis - natural products - dysidavarones - sesquiterpene quinones - meroterpenoidsSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2066-0860.
- Supporting Information
Publication History
Received: 28 February 2023
Accepted after revision: 30 March 2023
Accepted Manuscript online:
30 March 2023
Article published online:
09 May 2023
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- 18 Diketone 7 A 1.0 M solution of t-BuOK in THF (0.642 mL, 0.642 mmol, 1.0 equiv) was added to a stirred solution of Wieland–Miescher ketone derivative 8 (148 mg, 0.770 mmol, 1.2 equiv) in DMF (6 mL) at 0 °C, and the resulting mixture was heated to 23 °C and stirred at this temperature for 1 h. A solution of benzylic bromide 10 (217 mg, 0.642 mmol, 1.0 equiv) in DMF (2 mL) was added over 30 min at 23 °C under argon, and the resulting solution was stirred at 23 °C for 1 h. A 1.0 M solution of t-BuOK in THF (1.93 mL, 1.93 mmol, 3.0 equiv) was added to the resulting solution at 0 °C in three portions over 30 min each, on average, and the resulting solution was stirred at 100 °C for 2 h. The reaction was quenched with sat. aq NH4Cl (10 mL) and the mixture was extracted with EtOAc (3 × 20 mL). The combined organic layers were washed with brine (5 mL), dried (Na2SO4), filtered, and concentrated under reduced pressure. The crude product was purified by flash column chromatography [silica gel, PE–EtOAc (30:1→10:1)] to give a white foam; yield: 142 mg (60%, 0.385 mmol); Rf = 0.55 (silica gel, PE–EtOAc, 3:1); [α]D 23 +36.0 (c = 1.0, CHCl3). FTIR (KBr): 3709, 3688, 3672, 3627, 2360, 2338, 1717, 1520, 1454, 1338, 1212, 1109 cm−1. 1H NMR (400 MHz, CDCl3): δ = 6.72 (d, J = 8.4 Hz, 1 H), 6.62 (d, J = 8.4 Hz, 1 H), 5.96 (t, J = 4.2 Hz, 1 H), 4.16 (dq, J = 9.3, 7.0 Hz, 1 H), 4.06–3.93 (m, 3 H), 3.84 (dd, J = 8.6, 1.8 Hz, 1 H), 3.31 (d, J = 16.0 Hz, 1 H), 2.97 (d, J = 16.0 Hz, 1 H), 2.47 (dt, J = 12.9, 6.3 Hz, 1 H), 2.41–2.29 (m, 4 H), 2.22 (dt, J = 13.2, 6.5 Hz, 1 H), 1.45–1.33 (m, 9 H), 1.23 (s, 3 H). 13C NMR (101 MHz, CDCl3): δ = 217.3, 213.2, 150.5, 148.4, 145.4, 136.0, 126.5, 122.5, 121.5, 112.6, 68.5, 64.2, 50.3, 48.8, 46.1, 44.0, 42.9, 35.4, 26.4, 24.7, 24.5, 16.1, 15.0. HRMS (ESI-TOF): m/z [M + Na]+ calcd for C23H28NaO4: 391.1880; found: 391.1878.