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A solution of lithium diisopropylamide, prepared at 0° from 0.12 ml of diisopropylamine and 0.33 ml of n-butyllithium (2.5M) in 2 ml of tetrahydrofuran under nitrogen, is added to a solution of 0.13 ml of N,N,N',N'-tetramethyl-ethylenediamine and 0.124 g of 1-(p-bromobenzyl)-5-(3-chloropropyl)-1H-imidazole in 2 ml of tetrahydrofuran at -78°. The reaction mixture is stirred for 3.5 h, quenched at -78° with saturated ammonium chloride solution and extracted with methylene chloride (3×10 ml). The organic extracts are dried over sodium sulfate and evaporated to yield the title compound which is purified by conversion to the hydrochloride salt, m.p. 216°.

1. customquenched at -78° with saturated ammonium chloride solution
2. extractionextracted with methylene chloride (3×10 ml)
3. dry with materialThe organic extracts are dried over sodium sulfate
4. customevaporated