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Synlett 2018; 29(10): 1293-1296
DOI: 10.1055/s-0036-1591889
DOI: 10.1055/s-0036-1591889
letter
Lipase-Induced Oxidative Furan Rearrangements
We gratefully acknowledge support by the Suomen Akatemia (298250), the Deutsche Forschungsgemeinschaft (DE1599/4-1) and by Carbolution Chemicals.Further Information
Publication History
Received: 30 October 2017
Accepted: 17 December 2017
Publication Date:
15 January 2018 (online)
![](https://www.thieme-connect.de/media/synlett/201810/lookinside/thumbnails/st-2017-b0806-l_10-1055_s-0036-1591889-1.jpg)
Published as part of the Special Section 9th EuCheMS Organic Division Young Investigator Workshop
Abstract
Lipase B from Candida antarctica catalyzes the oxidative ring expansion of furfuryl alcohols using aqueous hydrogen peroxide to yield functionalized pyranones under mild conditions. The method further allows for the preparation of corresponding piperidinone derivatives by enzymatic rearrangement of N-protected furfurylamines.
Key words
Achmatowicz - ring expansion - furan - pyranone - synthetic methodology - heterocyclic chemistrySupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0036-1591889.
- Supporting Information
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References and Notes
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- 16 Representative Experimental Procedure The appropriate furfuryl alcohol (5 mmol) was dissolved in EtOAc (50 mL), and CAL-B (105 mg, 1.5 kU) and aq. H2O2 (50 % 858 μL, 15 mmol) were added. The reaction mixture was placed on an orbital shaker at 40 °C (200 rpm). After 24 h, phosphate buffer (15 mL, 100 mM, pH 7.0) and catalase (5 μL) were added, and the mixture was shaken for further 15 min. The organic phase was separated, and the aqueous phase was extracted with EtOAc (2 × 20 mL). The combined organic layers were dried over Na2SO4 and volatiles were removed under reduced pressure. The crude product was purified by flash column chromatography (hexane/EtOAc). 6-Hydroxy-2,2-dimethyl-2H-pyran-3(6H)-one (2h) Purified by column chromatography (SiO2, n-hexane/EtOAc 3:1 to 2:1) to give a colorless liquid (547 mg, 3.85 mmol, 77%). Rf = 0.33 (n-hexane/EtOAc, 2:1). 1H NMR (400 MHz, CDCl3): δ = 6.87 (dd, 3 J = 10.3 Hz, 3 J = 2.2 Hz, 1 H), 6.07 (dd, 3 J = 10.3 Hz, 4 J = 1.3 Hz, 1 H), 5.70–5.68 (m, 1 H), 3.38 (br s, 1 H), 1.49 (s, 3 H), 1.39 (s, 3 H) ppm. 13C NMR (100 MHz, CDCl3): δ = 198.9, 145.7, 126.6, 88.0, 79.5, 26.6, 23.9 ppm. FT-IR (ATR): ν = 3402 (br), 2982 (w), 1681 (s), 1380 (m), 1293 (m), 1238 (m), 1084 (m), 1036 (s), 924 (m) cm–1.
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