O-[2-(dimethylamino)ethyl]hydroxylamine;dihydrochloride

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the carboxylic acid (6b, 553 mg, 2.00 mmol) of Example 9 or 16 in dehydrated methylene chloride (10 mL) was cooled to 0° C. under an argon atmosphere, followed by adding dropwise isobutyl chloroformate (289 μL, 2.20 mmol). Then, triethylamine (293 μL) was added, followed by stirring for 30 minutes. Thereby, a mixed acid anhydride was prepared in the reaction system. To this reaction mixture were gradually added 2-(aminooxy)-N,N-dimethylethanamine dihydrochloride (591 mg) described in Reference Example 18 and triethylamine (930 μL) while washing with dehydrated methylene chloride (7.0 mL), followed by stirring at the same temperature for 1 hour. This reaction mixture was filtered though Kiriyama filter paper. Subsequently, the residue was washed with methanol and the filtrate was concentrated under reduced pressure. The resulting residue was dissolved in methylene chloride and water, and the organic layer extracted with methylene chloride was dried over magnesium sulfate, followed by distilling off under reduced pressure. The resulting residue was subjected to silica gel column chromatography (amino silica, chloroform/methanol=10/1) to afford 291.1 mg of the title compound as a colorless oil (yield 40%). while washing with dehydrated methylene chloride (7.0 mL) by stirring at the same temperature for 1 hour This reaction mixture was filtered though Kiriyama filter paper Subsequently, the residue was washed with methanol the filtrate was concentrated under reduced pressure The resulting residue was dissolved in methylene chloride water, and the organic layer extracted with methylene chloride was dried over magnesium sulfate by distilling off under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-4-(2-propanon-1-yl)piperazine (255 mg), O-[2-(dimethylamino)ethyl]hydroxylamine dihydrochloride (89 mg), sodium acetate (catalytically), and methanol (10 mL) was heated under reflux for 2 h. The solvent was removed in vacuo, and the residue was treated with dichloromethane and NAOH (aq, 2N). The layers were separated, the organic layer was dried and concentrated in vacuo. The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH/NH4OH 92/7.5/0.5) to afford 1-{(2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-piperazin-4-yl}-2-propanone O-[2-(dimethylamino)-ethyl]oxime 0.31 g (>95%) as an E/Z mixture. Rf 0.26 (CH2Cl2/MeOH/NH4OH 92/7.5/0.5). was heated under reflux for 2 h The solvent was removed in vacuo the residue was treated with dichloromethane and NAOH (aq, 2N) The layers were separated the organic layer was dried concentrated in vacuo The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH/NH4OH 92/7.5/0.5)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-4-(2-propanon-1-yl)piperazine (255 mg), O-[2-(dimethylamino)ethyl]hydroxylamine dihydrochloride (89 mg), sodium acetate (catalytically), and methanol (10 mL) was heated under reflux for 2 h. The solvent was removed in vacuo, and the residue was treated with dichloromethane and NAOH (aq, 2N). The layers were separated, the organic layer was dried and concentrated in vacuo. The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH/NH4OH 92/7.5/0.5) to afford 1-{(2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-piperazin-4-yl}-2-propanone O-[2-(dimethylamino)-ethyl]oxime 0.31 g (>95%) as an E/Z mixture. Rf 0.26 (CH2Cl2/MeOH/NH4OH 92/7.5/0.5). was heated under reflux for 2 h The solvent was removed in vacuo the residue was treated with dichloromethane and NAOH (aq, 2N) The layers were separated the organic layer was dried concentrated in vacuo The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH/NH4OH 92/7.5/0.5)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 0.21 g of 2-dimethylaminoethoxyamine dihydrochloride, 2.00 g of sodium acetate in 25 ml of 0.2M acetic acid a solution of 0.30 g of 3-oxo-14β-hydroxy-5β-androstane-17β-carboxaldehyde (Prepn. 6) in 40 ml of dioxane was added dropwise. After 2 hrs at room temperature, the mixture was evaporated to dryness under reduced pressure and the crude product was extracted three times with iso-propanol. Evaporation of the solvent gave 0.33 g of (E)-3-oxo-17β-(2-dimethylaminoethoxyiminomethyl)-5β-androstane-14β-ol acetate as a white foam. the mixture was evaporated to dryness under reduced pressure the crude product was extracted three times with iso-propanol Evaporation of the solvent

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the carboxylic acid (6b, 553 mg, 2.00 mmol) of Example 9 or 16 in dehydrated methylene chloride (10 mL) was cooled to 0° C. under an argon atmosphere, followed by adding dropwise isobutyl chloroformate (289 μL, 2.20 mmol). Then, triethylamine (293 μL) was added, followed by stirring for 30 minutes. Thereby, a mixed acid anhydride was prepared in the reaction system. To this reaction mixture were gradually added 2-(aminooxy)-N,N-dimethylethanamine dihydrochloride (591 mg) described in Reference Example 18 and triethylamine (930 μL) while washing with dehydrated methylene chloride (7.0 mL), followed by stirring at the same temperature for 1 hour. This reaction mixture was filtered though Kiriyama filter paper. Subsequently, the residue was washed with methanol and the filtrate was concentrated under reduced pressure. The resulting residue was dissolved in methylene chloride and water, and the organic layer extracted with methylene chloride was dried over magnesium sulfate, followed by distilling off under reduced pressure. The resulting residue was subjected to silica gel column chromatography (amino silica, chloroform/methanol=10/1) to afford 291.1 mg of the title compound as a colorless oil (yield 40%). while washing with dehydrated methylene chloride (7.0 mL) by stirring at the same temperature for 1 hour This reaction mixture was filtered though Kiriyama filter paper Subsequently, the residue was washed with methanol the filtrate was concentrated under reduced pressure The resulting residue was dissolved in methylene chloride water, and the organic layer extracted with methylene chloride was dried over magnesium sulfate by distilling off under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-4-(2-propanon-1-yl)piperazine (255 mg), O-[2-(dimethylamino)ethyl]hydroxylamine dihydrochloride (89 mg), sodium acetate (catalytically), and methanol (10 mL) was heated under reflux for 2 h. The solvent was removed in vacuo, and the residue was treated with dichloromethane and NAOH (aq, 2N). The layers were separated, the organic layer was dried and concentrated in vacuo. The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH/NH4OH 92/7.5/0.5) to afford 1-{(2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-piperazin-4-yl}-2-propanone O-[2-(dimethylamino)-ethyl]oxime 0.31 g (>95%) as an E/Z mixture. Rf 0.26 (CH2Cl2/MeOH/NH4OH 92/7.5/0.5). was heated under reflux for 2 h The solvent was removed in vacuo the residue was treated with dichloromethane and NAOH (aq, 2N) The layers were separated the organic layer was dried concentrated in vacuo The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH/NH4OH 92/7.5/0.5)