Synlett 2024; 35(05): 582-585
DOI: 10.1055/a-2066-0860
cluster
Biomimetic Synthesis

Practical and Scalable Total Syntheses of (+)-Dysidavarones A–C

Yang Kuang
,
Le Chang
,
Bingjian Wang
,
Jingyi Kang
,
Chuanke Chong
,
Zhaoyong Lu
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.

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

© 2023. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

 
  • References and Notes

  • 1 Jiao W.-H, Huang X.-J, Yang J.-S, Yang F, Piao S.-J, Gao H, Li J, Ye W.-C, Yao X.-S, Chen W.-S, Lin H.-W. Org. Lett. 2012; 14: 202
  • 2 Schmalzbauer B, Herrmann J, Müller R, Menche D. Org. Lett. 2013; 15: 964
  • 3 Fukui Y, Narita K, Katoh T. Chem. Eur. J. 2014; 20: 2436
  • 4 Yu C, Zhang X, Zhang J, Shen Z. Tetrahedron 2016; 72: 4337
  • 5 Li Y.-M, Sun Y.-T, Li B.-Y, Qin H.-B. Org. Lett. 2021; 23: 7254
  • 6 Zhu W, Yin Q, Lou Z, Yang M. Nat. Commun. 2022; 13: 6633
  • 7 Zhang Q, Kuang Y, Chang L, Kang J, Wang B, Chong C, Lu Z. Chin. Chem. Lett. 2023; 34: 108338
  • 8 Adouama C, Budén ME, Guerra WD. Org. Lett. 2019; 21: 320
  • 9 Lo JC, Yabe Y, Baran PS. J. Am. Chem. Soc. 2014; 136: 1304
  • 10 Lo JC, Gui J, Yabe Y, Pan C.-M, Baran PS. Nature 2014; 516: 343
  • 11 Iwasaki K, Wan KK, Oppedisano A, Crossley SW. M, Shenvi RA. J. Am. Chem. Soc. 2014; 136: 1300
  • 12 Green SA, Crossley SW. M, Matos JL. M, Vásquez-Céspedes S, Shevick SL, Shenvi RA. Acc. Chem. Res. 2018; 51: 2628
  • 13 Wu J, Ma Z. Org. Chem. Front. 2021; 8: 7050
  • 14 Brown HC, Kramer GW, Hubbard JL, Krishnamurthy S. J. Organomet. Chem. 1980; 188: 1
  • 15 Crabtree RH, Felkin H, Fillebeen-Khan T, Morris GE. J. Organomet. Chem. 1979; 168: 183
  • 16 Bartlett PA, Johnson WS. Tetrahedron Lett. 1970; 4459
  • 17 Chong C, Zhang Q, Ke J, Zhang H, Yang X, Wang B, Ding W, Lu Z. Angew. Chem. Int. Ed. 2021; 60: 13807 ; Angew. Chem. 2021, 133, 13926
  • 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.