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0 °C

To a solution of 5-[4-(3-chlorophenyl)-7-ethyl-2-phenylpyrrolo[1,2-b]pyridazin-3-yl]-1-pentanol (55 mg) and triethylamine (19.9 mg) in dichloromethane (3 mL) was added methanesulfonyl chloride (165 mg) under ice-water cooling and the mixture was stirred at 0° C. for 1 hour. The solution was washed with brine, dried over magnesium sulfate, and evaporated in vacuo. To the residue in 1,2-dichloroethane (3 mL) was added 2 M dimethylamine in tetrahydrofuran (3 mL) and the mixture was stirred at 60° C. for 120 hours. The solution was diluted with chloroform, washed with brine, dried over magnesium sulfate, and evaporated in vacuo. The residue was purified by silica gel column chromatography eluting with a mixture of hexane and ethyl acetate (20:1-5:1) to give 5-[4-(3-chlorophenyl)-7-ethyl-2-phenylpyrrolo[1,2-b]pyridazin-3-yl]-N,N-dimethyl-1-pentanamine as an yellow oil (38 mg).

1. washThe solution was washed with brine
2. dry with materialdried over magnesium sulfate
3. customevaporated in vacuo
4. additionTo the residue in 1,2-dichloroethane (3 mL) was added 2 M dimethylamine in tetrahydrofuran (3 mL)
5. stirringthe mixture was stirred at 60° C. for 120 hours
6. additionThe solution was diluted with chloroform
7. washwashed with brine
8. dry with materialdried over magnesium sulfate
9. customevaporated in vacuo
10. customThe residue was purified by silica gel column chromatography
11. washeluting with a mixture of hexane and ethyl acetate (20:1-5:1)