Dibutyl Vinylboronate (stabilized with Phenothiazine) → 4-Vinylfuran-2-carbaldehyde

反応式

Br[C:2]1[CH:3]=[C:4]([CH:7]=[O:8])[O:5][CH:6]=1.[CH2:9](OB(C=C)OCCCC)[CH2:10]CC.C(C1OC(C=O)=CC=1)C1C=CC=CC=1>CN(C)C=O>[CH:9]([C:2]1[CH:3]=[C:4]([CH:7]=[O:8])[O:5][CH:6]=1)=[CH2:10]

参加物

実験手順

The title compound was synthesized from 4-bromo-furan-2-carbaldehyde (1.1 g, 6.29 mmol) and vinylboronic acid dibutyl ester (1.67 mL, 7.54 mmol) using the same conditions used to synthesize 5-benzyl-furan-2-carbaldehyde, with the exception that the reaction was run in N,N-dimethylformamide (DMF) (20 mL). Purification by flash chromatography (0-30% EtOAc in heptane) provided 4-vinylfuran-2-carbaldehyde as an orange oil; Yield 282 mg (37%). 1H NMR (400 MHz, CDCl3) δ ppm 5.31 (dd, J=10.88, 0.93 Hz, 1 H), 5.61 (dd, J=17.57, 0.54 Hz, 1 H), 6.56 (dd, J=17.55, 10.91 Hz, 1 H), 7.37 (s, 1 H), 7.67 (s, 1 H), 9.66 (d, J=0.59 Hz, 1 H).