Reaction equation
[CH3:1][O:2][C:3](=[O:29])[CH:4]([CH2:24][CH:25]=[CH:26][CH2:27]Br)[CH2:5][C:6]([CH3:23])=[CH:7][CH2:8][C:9]1[C:10]([OH:22])=[C:11]2[C:15](=[C:16]([CH3:20])[C:17]=1[O:18][CH3:19])[CH2:14][O:13][C:12]2=[O:21].[CH3:30][O:31][P:32]([O:35]C)[O:33][CH3:34]>>[CH3:1][O:2][C:3](=[O:29])[CH:4]([CH2:24][CH:25]=[CH:26][CH2:27][P:32]([O:33][CH3:34])([O:31][CH3:30])=[O:35])[CH2:5][C:6]([CH3:23])=[CH:7][CH2:8][C:9]1[C:10]([OH:22])=[C:11]2[C:15](=[C:16]([CH3:20])[C:17]=1[O:18][CH3:19])[CH2:14][O:13][C:12]2=[O:21]Participants
Reactant 2
Product 1
Procedure
Under a N2 atmosphere, a solution of 2-(4-bromo-but-2-enyl)-6-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-4-methyl-hex-4-enoic acid methyl ester (490 mg, 1.05 mmol) in trimethylphosphite (2.5 mL, 21.1 mmol) was heated at 120° C. for 1 hour. The reaction was allowed to cool to room temperature. The reaction mixture was worked up by removal of the solvent in vacuo followed by chromatography using EtOAc-hexanes to provide 460 mg (88%) of the product as an oil. 1H NMR (300 MHz, CDCl3) δ 1.77 (s, 3H), 2.081-2.31 (m, 4H), 2.15 (s, 3H), 2.52 (d, 1H, J=22 Hz), 2.54 (d, 1H, J=22 Hz), 2.55-2.63 (m, 1H), 3.36 (d, 2H, J=7 Hz), 3.57 (s, 3H), 3.72 (d, 6H, J=11 Hz), 3.76 (s, 3H), 5.20 (s, 2H), 5.20-5.26 (m, 1H), 5.36-5.56 (m, 2H), 7.69 (s, 1H) ppm; 31P (121.4 MHz, CDCl3) δ 30.1 ppm; MS (m/z) 497.2 [M+H]+, 519.2 [M+Na]+.
Workup
- customThe reaction mixture was worked up by removal of the solvent in vacuo
Sources & evidence
- ORD record
- ord-1a865100076b4672ad8181138f804ad5
- Source dataset
- uspto-grants-2008_11
- Patent number
- US07452901B2
Linked notes
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