[Li].C(NC(C)C)(C)C.C=CC1C=CC=CC=1.[CH3:17][C:18]1[CH:22]=[C:21]([CH3:23])[O:20][N:19]=1.Br[CH2:25][CH2:26][CH2:27][CH2:28][CH2:29][CH2:30][O:31][C:32]1[CH:39]=[CH:38][C:35]([C:36]#[N:37])=[CH:34][CH:33]=1>O1CCCC1>[C:36]([C:35]1[CH:38]=[CH:39][C:32]([O:31][CH2:30][CH2:29][CH2:28][CH2:27][CH2:26][CH2:25][CH2:23][C:21]2[O:20][N:19]=[C:18]([CH3:17])[CH:22]=2)=[CH:33][CH:34]=1)#[N:37]To a suspension of 301 mg of lithium wire (1/4 inch portions) in 10 ml of tetrahydrofuran under nitrogen was added 6.72 ml of diisopropylamine and 3.44 ml of styrene while maintaining the temperature at 25° C. The mixture was stirred until all the lithium had dissolved (about four hours) and then cooled to -55° C. 3,5-Dimethylisoxazole (4.3 g) in 10 ml of tetrahydrofuran was then added dropwise and the mixture stirred for an hour at -55° C. 4-(6-Bromohexyloxy)benzonitrile (12 g) in 10 ml of tetrahydrofuran was then added dropwise over a period of one hour, and the mixture was allowed to warm to room temperature and stirred for three days. The solvent was removed in vacuo, the residue treated with 5% ammonium chloride solution and extracted with ether. The ether extracts were dried and concentrated, and the residue subjected to high pressure liquid chromatography with ether-hexane (1:1) mixture to give 3.9 g of 5-[7-(4-cyanophenoxy)heptyl]-3-methylisoxazole, used directly in the next reaction.
Wird geladen…
