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General procedure for the preparation of N-substituted diamine dihydrochloride salts 1-10. To a solution of 1,4-butanediamine or 1,6-hexanediamine (20mmol) in 25mL of ethanol at reflux was slowly added the alkyl mesylate (20mmol). The reaction mixture was maintained under reflux during 20h. The solvent was evaporated under reduced pressure and the residue was extracted with water/dichlorometane (33×). The organic phase was evaporated under reduced pressure and the residue purified by recrystalization from hexane. After that, these compounds were redissolved in methanol and concentrated HCl was added until pH ∼2. The corresponding dihydrochloride salts were purified by simple recrystallization furnishing compounds 1-10 in 45-73% yield
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General procedure for the preparation of N-substituted diamine dihydrochloride salts 1-10. To a solution of 1,4-butanediamine or 1,6-hexanediamine (20mmol) in 25mL of ethanol at reflux was slowly added the alkyl mesylate (20mmol). The reaction mixture was maintained under reflux during 20h. The solvent was evaporated under reduced pressure and the residue was extracted with water/dichlorometane (3×). The organic phase was evaporated under reduced pressure and the residue purified by recrystalization from hexane. After that, these compounds were redissolved in methanol and concentrated HCl was added until pH ∼2. The corresponding dihydrochloride salts were purified by simple recrystallization furnishing compounds 1-10 in 45-73% yield.
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