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38949145173
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Preparation of Silyl Enol Ethers 5: To a stirred solution of LDA or LiHMDS [22 mmol; prepared from i-Pr2NH or hexamethyldisilazane and n-BuLi (22 mmol, in THF (22 mL) at -78°C was added aldehyde 8 (20 mmol) in THF (6 mL, After 30 min the reaction mixture was warmed to -15°C and TBSCl (26 mmol) in THF (6 mL) was added. The mixture was allowed to react at r.t. and pentane (50 mL) was added. After filtration, the organic layers were evaporated in vacuo. The residue was purified by flash chromatography (PE-Et2O, 90:10) to afford the silyl enol ethers 5 as a pale yellow oil as a single stereoisomer of an unknown configuration (49% in 5a and 63% in 5b, 5a: IR (film, 1680 cm-1. 1H NMR (200 MHz, C6D 6, δ, 5.72 (s, 1 H, 3.41 (s, 3 H, 3.32 (m, 2 H, 1.14 (m, 6 H, 0.8 (s, 9 H, 0.1 (s, 6 H, 13C NMR 50 MHz, C 6D6
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6): δ = 153.13, 132.46, 118.78, 60.35, 43.64, 26.57, 26.29, 25.72, 24.12, 17.69, 13.31, -5.80.
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38949106037
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5b
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5b
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38949096238
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Synthesis of Ketoaldehydes 4: To a solution of 5 (8 mmol) in nitromethane (5 mL) were added at 0°C a hemiacetal vinylog 9 (5 mmol) in nitromethane (5 mL) and BF3·Et2O-Et 2O (4:1; 1.8 mmol, 300 μL, The mixture was kept at r.t. until disappearance of 5 (TLC, 4 h) and then hydrolysed at 0°C with sat. NaHCO3 (5 mL, The mixture was extracted with CH2Cl 2, dried over MgSO4, filtered and evaporated. The crude product was treated with aq 1.5 M HCl at r.t. for 30 min. and extracted with CH2Cl2, dried over MgSO4, filtered and evaporated. Purification was performed by flash chromatography (PE-Et 2O, 90:10 → 70:30, providing ketoaldehydes 4 as a pale yellow oil (23% in 4a and 24% in 4b, 4a: IR (film, 1710, 1680 cm-1. 1H NMR (200 MHz, CDCl3, δ, 9.30 s, 1 H
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3): δ = 9.30 (s, 1 H), 4.10 (q, J = 6.7 Hz, 2 H), 4.00 (m, 2 H), 2.62 (m, 2 H), 2.20 (m, 2 H), 2.12 (s, 3 H), 1.60 (m, 6 H), 1.25 (t, J = 6.7 Hz, 3 H).
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38949147263
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The low yield of N-benzylation was previously reported for similar compounds
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(a) The low yield of N-benzylation was previously reported for similar compounds.
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(b) Holmes, A. B.; Raithby, P. R.; Russel, K.; Stern, E. S.; Stubbs, M. E.; Wellard, N. K. J. Chem. Soc., Chem. Commun. 1984, 1191.
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(1984)
J. Chem. Soc., Chem. Commun
, pp. 1191
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Holmes, A.B.1
Raithby, P.R.2
Russel, K.3
Stern, E.S.4
Stubbs, M.E.5
Wellard, N.K.6
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