piperidin-4-ylhydrazine;dihydrochloride

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 0.1 mole of 4-(N′-tert-Butoxycarbonyl-hydrazino)-piperidine-1-carboxylic acid tert-butyl ester (starting compound A6) and 150 ml of concentrated hydrochloric acid is heated at 90° C. for 60 min after which the clear solution is evaporated. The residue is washed with tetrahydrofurane, filtered off and dried under vacuum. M. p. 256-259° C. is evaporated The residue is washed with tetrahydrofurane filtered off dried under vacuum

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

Procedure: A solution of 50 mmol of the salt of (S)-(−)-α-methylbenzylamine and (cis)-2-(3,4-dimethoxybenzoyl)-1,2,3,6-tetrahydrobenzoic acid (starting compound A8), 55 mmol of piperidin-4-yl-hydrazine dihydrochloride and 100 mmol of triethylamine in 150 ml of 1-propanol is refluxed for 18 h. After cooling to RT, the precipitate is filtered off and dried. M. p. 285-288° C. the precipitate is filtered off dried

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

Procedure: A solution of 50 mmol of the salt of (S)-(−)-α-methylbenzylamine and (cis)-2-(3,4-dimethoxybenzoyl)-1,2,3,6-tetrahydrobenzoic acid (starting compound A8), 55 mmol of piperidin-4-yl-hydrazine dihydrochloride and 100 mmol of triethylamine in 150 ml of 1-propanol is refluxed for 18 h. After cooling to RT, the precipitate is filtered off and dried. M. p. 285-288° C. the precipitate is filtered off dried

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

Procedure: Prepared from the salt of (S)-(−)-α-methylbenzylamine, (cis)-2-(3,4-diethoxybenzoyl)-1,2,3,6-tetrahydrobenzoic acid (compound P) and piperidin-4-yl-hydrazine dihydrochloride in 2-propanol as described for compound 5d. M. p. 248-250° C.

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

Procedure: Prepared from the salt of (S)-(−)-α-methylbenzylamine, (cis)-2-(3,4-diethoxybenzoyl)-1,2,3,6-tetrahydrobenzoic acid (compound P) and piperidin-4-yl-hydrazine dihydrochloride in 2-propanol as described for compound 5d. M. p. 248-250° C.

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 0.1 mole of 4-(N′-tert-butoxycarbonyl-hydrazino)-piperidine-1-carboxylic acid tert-butyl ester (compound 5f) and 150 ml of concentrated hydrochloric acid is heated at 90° C. for 60 min after which the clear solution is evaporated. The residue is washed with tetrahydrofurane, filtered off and dried under vacuum. M. p. 256-259° C. is evaporated The residue is washed with tetrahydrofurane filtered off dried under vacuum

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 0.1 mole of 4-(N′-tert-butoxycarbonyl-hydrazino)-piperidine-1-carboxylic acid tert-butyl ester (compound 5f) and 150 ml of concentrated hydrochloric acid is heated at 90° C. for 60 min after which the clear solution is evaporated. The residue is washed with tetrahydrofurane, filtered off and dried under vacuum. M. p. 256-259° C. is evaporated The residue is washed with tetrahydrofurane filtered off dried under vacuum

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

Procedure: Prepared analogous as described for the example B1 (Alternative 2) using methyl 3-(7-methoxy-2,2-dimethyl-2,3-dihydro-1-benzofuran-5-yl)-2,2-dimethyl-3-oxopropanoate (compound D12) and piperidin-4-yl-hydrazine dihydrochloride as starting compounds resulting in the title compound. (compound B12) Prepared analogous

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1000 g of methyl 3-(3,4-dimethoxyphenyl)-2,2-dimethyl-3-oxopropanoate (compound D1) are dissolved in 10.5 l of methanol. 2500 g piperidin-4-yl-hydrazine dihydrochloride, solved in 4 l of water are added rapidly. The mixture is heated to reflux and kept at reflux temperature for 4 days. The reaction mixture is cooled to 20° C., 10 l of water are added and then methanol is removed by distillation in vacuum. The aqueous solution is allowed to stand overnight at RT. The solution is cooled and aqueous sodium hydroxide (c=10 mol/l) (about 2 l) is added during 4 to 5 h by keeping the temperature below 20° C. and the pH should be higher than 13. The product crystallizes during adding of sodium hydroxyide. The mixture is stirred 1 h at 10° C., filtered over a filter press and washed with 0.51 of water. The product is dried at 50° C. in a circulating air dryer resulting in the title compound. (compound B1) are added rapidly The mixture is heated to reflux at reflux temperature for 4 days methanol is removed by distillation in vacuum The solution is cooled aqueous sodium hydroxide (c=10 mol/l) (about 2 l) is added during 4 to 5 h the temperature below 20° C. The product crystallizes during adding of sodium hydroxyide filtered over a filter press washed with 0.51 of water The product is dried at 50° C. in a circulating air dryer

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1000 g of methyl 3-(3,4-dimethoxyphenyl)-2,2-dimethyl-3-oxopropanoate (compound D1) are dissolved in 10.5 l of methanol. 2500 g piperidin-4-yl-hydrazine dihydrochloride, solved in 4 l of water are added rapidly. The mixture is heated to reflux and kept at reflux temperature for 4 days. The reaction mixture is cooled to 20° C., 10 l of water are added and then methanol is removed by distillation in vacuum. The aqueous solution is allowed to stand overnight at RT. The solution is cooled and aqueous sodium hydroxide (c=10 mol/l) (about 2 l) is added during 4 to 5 h by keeping the temperature below 20° C. and the pH should be higher than 13. The product crystallizes during adding of sodium hydroxyide. The mixture is stirred 1 h at 10° C., filtered over a filter press and washed with 0.51 of water. The product is dried at 50° C. in a circulating air dryer resulting in the title compound. (compound B1) are added rapidly The mixture is heated to reflux at reflux temperature for 4 days methanol is removed by distillation in vacuum The solution is cooled aqueous sodium hydroxide (c=10 mol/l) (about 2 l) is added during 4 to 5 h the temperature below 20° C. The product crystallizes during adding of sodium hydroxyide filtered over a filter press washed with 0.51 of water The product is dried at 50° C. in a circulating air dryer

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 0.1 mole of 4-(N′-tert-Butoxycarbonyl-hydrazino)-piperidine-1-carboxylic acid tert-butyl ester (starting compound A6) and 150 ml of concentrated hydrochloric acid is heated at 90° C. for 60 min after which the clear solution is evaporated. The residue is washed with tetrahydrofurane, filtered off and dried under vacuum. M.p. 256-259° C. is evaporated The residue is washed with tetrahydrofurane filtered off dried under vacuum

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

Procedure: A solution of 50 mmol of the salt of (S)-(−)-α-methylbenzylamine and (cis)-2-(3,4-dimethoxybenzoyl)-1,2,3,6-tetrahydrobenzoic acid (starting compound A8), 55 mmol of piperidin-4-yl-hydrazine dihydrochloride and 100 mmol of triethylamine in 150 ml of 1-propanol is refluxed for 18 h. After cooling to RT, the precipitate is filtered off and dried. M.p. 285-288° C. the precipitate is filtered off dried