[CH:1]1[CH:6]=[C:5]([Cl:7])[C:4]([NH:8][C:9]2[NH:13][CH2:12][CH2:11][N:10]=2)=[C:3]([Cl:14])[CH:2]=1.Br[CH2:16][CH2:17][C:18]([CH3:20])=[CH2:19].C(N(CC)CC)C>C1(C)C=CC=CC=1>[Cl:14][C:3]1[CH:2]=[CH:1][CH:6]=[C:5]([Cl:7])[C:4]=1[N:8]([C:9]1[NH:10][CH2:11][CH2:12][N:13]=1)[CH2:16][CH2:17][C:18]([CH3:20])=[CH2:19]A mixture of 6.9 gm (0.03 mol) of clonidine, 5.6 gm of 4-bromo-2-methyl-1-butene, and 5 ml of triethylamine in 25 ml of toluene was heated for 24 hours at 120° C. After cooling, the solvent was decanted, and the residue remaining was dissolved in 1 N hydrochloric acid. After extraction with ether several times (the ethereal extracts were abandoned), the solution was extracted with ether in fractions at stepwisely rising pH values (alkalizing with 2 N sodium hydroxide solution). The thin-layer chromatographically uniform ether extracts were united and dried over MgSO4, and the ether was evaporated in vacuo.
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