[S:1]1[CH:5]=[CH:4][CH:3]=[CH:2]1.C([Li])CCC.I[CH2:12][CH:13]([CH2:22][CH2:23][CH2:24][CH2:25][CH2:26][CH3:27])[CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH3:21].O>C1COCC1>[CH2:22]([CH:13]([CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH3:21])[CH2:12][C:2]1[S:1][CH:5]=[CH:4][CH:3]=1)[CH2:23][CH2:24][CH2:25][CH2:26][CH3:27]A solution of thiophene (46.4 g, 551 mmol., 2.50 equiv.) and THF (300 mL) was cooled to −78° C. n-Butyllithium (2.5 M in hexanes, 212 mL, 528 mmol., 2.40 equiv.) was added over 1 hour. The mixture was stirred for an additional 30 minutes at −78° C. before a solution of 1-iodo-2-hexyldecane (90.0 g, 220 mmol., 1.00 equiv) in THF (200 mL) was added slowly over 1 hour. After stirring for 1 hour at −78° C., the reaction mixture was warmed to ambient temperature and stirred for 18 hours. Water (200 mL) was added and the organic material was extracted with Et2O (3×250 mL), washed with additional water, dried over Na2SO4, filtered, and concentrated in vacuo. The resulting brown residue was purified by silica gel column chromatography (hexanes) to give a pale yellow oil (52.03 g, 77% yield). 1H NMR (500 MHz, CDCl3) δ 7.12 (dd, J=5.2, 1.2 Hz, 1H), 6.92 (m, 1H), 6.76 (dd, J=3.4, 0.9 Hz, 1H), 2.76 (d, J=6.7, 2H), 1.62 (b, 1H), 1.33-1.21 (m, 24H), 0.91-0.87 (m, 6H).
Wird geladen…
