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For representative recent examples of tetrahydrofuran syntheses, see: a, Bird, C. W, Ed, Pergamon Press: Oxford
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For representative recent examples of tetrahydrofuran syntheses, see: (a) Friedrichsen, W. In Comprehensive Heterocyclic Chemistry II, Vol. 2; Bird, C. W., Ed.; Pergamon Press: Oxford, 1996, 351.
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General procedure for the reduction of cycloadduct 5: To cycloadduct 5 (1 mmol) dissolved in MeOH (12 mL) was added NiCl 2·6H2O (5 mmol) followed by distilled H 2O (2 mL, NaBH4 (2 mmol) was then added and the reaction mixture was stirred vigorously at r.t, The progress of the reaction was monitored by TLC using PE-EtOAc (9:1) and showed the complete disappearance of starting material after 15 min. The reaction was quenched with MeOH (10 mL) and the reaction mixture was filtered through a pad of celite and washed with MeOH. H2O (50 mL) was added to the combined filtrate, which was extracted with CH2Cl2 (3 x 15 mL, The combined CH 2Cl2 extract was dried over anhyd MgSO4, decanted through a cotton pad and concentrated in vacuo. The product was purified by column chromatography using silica gel (60-120 mesh) and PE-EtOAc as eluent
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4, decanted through a cotton pad and concentrated in vacuo. The product was purified by column chromatography using silica gel (60-120 mesh) and PE-EtOAc as eluent.
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4, decanted through a cotton pad and concentrated in vacuo. The product was purified by column chromatography using silica gel (60-120 mesh) and PE-EtOAc (9:1) as eluent.
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4, decanted through a cotton pad and concentrated in vacuo. The product was purified by column chromatography using silica gel (60-120 mesh) and PE-EtOAc (9:1) as eluent.
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Typical procedure: A slight excess of SOCl2 (1 g, 8.4 mmol) in anhyd CCl4 (15 mL) at 0°C was added over a few minutes to a solution of oxime 6 (R, OEt, 1.5 g, 8 mmol) in CCl4, also at 0°C. Immediately after the addition, vigorous evolution of H 2 took place, the mixture was allowed to stir for another 10 min and then MeOH (10 mL) was added and the resulting solution was stirred for another 30 min. The solution was quenched with NaHCO3 and extracted using CH2Cl2 (2 x 30 mL, Evaporation of the solvent in vacuo and column chromatography of the residue on silica gel (EtOAc-PE, 1:9) gave tetrahydrofuran 7 (R, OEt) as a pale yellow oil (1.7 g, 90, IR: 2922, 2243, 1107, 1045 cm-1; 1H NMR (500 MHz, CDCl3, δ, 5.02 (dd, J, 1.5, 3.3 Hz, 1 H, 4.10 (m, 1 H, 4.06 (m, 1 H) 3.55 (m, 1 H, 3.34 (s, 3 H, 3.33 (m, 1 H, 2.60-2.50 m, 2 H, 2.1
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3Na: 222.1106; found: 222.1105.
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