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Synlett 2013; 24(8): 955-958
DOI: 10.1055/s-0032-1316899
DOI: 10.1055/s-0032-1316899
letter
Approach to the Core Structure of the Polycyclic Alkaloid Palhinine A
Further Information
Publication History
Received: 11 February 2013
Accepted after revision: 18 March 2013
Publication Date:
09 April 2013 (online)
![](https://www.thieme-connect.de/media/synlett/201308/lookinside/thumbnails/10.1055-s-0032-1316899-1.jpg)
Abstract
A synthesis of the tricyclic partly substituted core structure of palhinine A was achieved. To reach the bicyclo[2.2.2]octane motif a domino Michael reaction was employed as a key step. After Arndt–Eistert homologation and intramolecular aldol reaction the isotwistane core could be obtained after simple functional-group manipulations.
Key words
palhinine A - domino Michael reaction - X-ray crystal structure - Arndt–Eistert homologation - intramolecular aldol reactionSupporting Information
- for this article is available online at http://www.thieme-connect.com/ejournals/toc/synlett.
- Supporting Information
Primary Data
- for this article are available online at http://www.thieme-connect.com/ejournals/toc/synlett and can be cited using the following DOI: 10.4125/pd0043th.
- Primary Data
-
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- 16 Acetate 17 To a solution of tosylhydrazone 16 (182 mg, 270 μmol) in abs. MeOH (3 mL) were added anhyd ZnCl2 (44 mg, 703 μmol, 2.6 equiv) and NaCNBH3 (59 mg, 433 μmol, 1.6 equiv) at r.t. The reaction was then stirred at reflux temperature for 3.5 h. Then additional NaCNBH3 (59 mg, 433 μmol, 1.6 equiv) was added and reflux was continued for 2 h. Thereafter, the mixture was cooled to r.t. and treated with aq NaOH (10 mL, 1 M) and sat. NaCl solution (10 mL). The milky mixture was extracted with EtOAc (3 × 40 mL). The combined organic layers were dried over Na2SO4, filtered, concentrated in vacuo, and purified by flash chromatography (1.5 × 15 cm, PE–EtOAc, 10:1 to 0:1) to give 94 mg (192 μmol, 71%) of acetate 17 as a colorless oil; Rf = 0.63 (cyclohexane–EtOAc = 2:1). 1H NMR (400 MHz, CDCl3): δ = 1.05 (s, 9 H, H t-Bu), 1.16–1.31 (m, 2 H, 2′-H, 10-H), 1.35–1.64 (m, 9 H, 1-H, 1′-H, 2′-H, 5-H, 8-H, 9-H), 1.73–1.95 (m, 9 H, 2-H, 3-H, 5-H, 6-H, 10-H, CH3CO2), 3.56–3.69 (m, 2 H, 3′-H), 4.89–4.96 (m, 1 H, 4-H), 7.34–7.45 (m, 6 H, HAr), 7.65–7.70 (m, 4 H, HAr). 13C NMR (100 MHz, CDCl3): δ = 19.2 [C(CH3)3], 21.3 (CH3CO2), 24.0 (C-8), 24.0 (C-1), 26.9 [C(CH3)3], 27.3 (C-1′),28.6 (C-9), 33.2 (C-2′), 34.4 (C-5), 37.1 (C-10), 38.5 (C-6), 40.7 (C-7), 41.1 (C-2), 44.9 (C-3), 64.8 (C-3′), 85.3 (C-4), 127.6 (CAr), 129.5 (CAr), 134.1 (CAr), 134.1 (CAr), 135.5 (CAr), 170.9 (CH3 CO2). HRMS: calcd for C31H42O3Si [M + Na]+: 513.279543; found: 513.279442.
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- 18 Ketone 5 To a solution of alcohol 18 (58 mg, 129 μmol) in abs. CH2Cl2 (1.3 mL) were added NaHCO3 (43 mg, 517 μmol, 4 equiv) and DMP (71 mg, 168 μmol, 1.3 equiv) at r.t. After 1 h at r.t. DMP (71 mg, 168 μmol, 1.3 equiv) was added. After additional 30 min at r.t. sat. aq NaHCO3 solution (2 mL) and sat. aq Na2S2O3 solution (2 mL) were added, and the mixture was stirred for 30 min. H2O (5 mL) was added, and the mixture was extracted with Et2O (3 × 15 mL). The combined organic layers were washed with sat. NaCl solution (10 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by flash chromatography (1.5 × 15 cm, PE–EtOAc = 8:1) to give 51 mg (114 μmol, 88%) of tricyclic ketone 5 as a colorless oil; Rf = 0.45 (cyclohexane–EtOAc, 5:1). 1H NMR (400 MHz, CDCl3): δ = 1.04 (s, 9 H, H t-Bu), 1.08–1.28 (m, 2 H, 1′-H), 1.36–1.72 (m, 9 H, 1-H, 2-H, 2′-H, 8-H, 9-H, 10-H), 1.79–2.05 (m, 4 H, 2-H, 3-H, 5-H, 10-H), 2.13–2.21 (m, 1 H, 6-H), 2.42 (dd, J = 7.2, 18.8 Hz, 1 H, 5-H), 3.53–3.66 (m, 2 H, 3′-H), 7.33–7.46 (m, 6 H, HAr), 7.60–7.68 (m, 4 H, HAr). 13C NMR (100 MHz, CDCl3): δ = 19.1 [C(CH3)3], 24.0 (C-8), 24.3 (C-1), 26.8 [C(CH3)3], 27.1 (C-2′), 28.0 (C-9), 30.5 (C-2), 33.7 (C-1′), 35.0 (C-6), 36.5 (C-10), 38.6 (C-7), 45.4 (C-5), 51.5 (C-3), 64.1 (C-3′), 127.6 (CAr), 129.5 (CAr), 133.9 (CAr), 135.5 (CAr), 222.4 (C-4). HRMS: m/z calcd for C29H38O2Si [M + Na]+: 469.253328; found: 469.253565.
For representative bimolecular domino Michael reactions, see:
For representative intramolecular domino Michael reactions, see:
For some reviews, see:
Addition reactions with Grignard reagents derived from ω-halohydrins:
Addition reactions with other Grignard reagents: