2-methylpentan-3-one

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

Procedure: The title compound (15 mg) was prepared from (S)-2-tert-butoxycarbonylamino-3-{(S)-2-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester, which was deprotected according to General Procedure C, then treated with 2-methyl-3-pentanone according to General Procedure M. The reductive amination product was subjected to General Procedures V and B in succession, then the resulting acid and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yl)-phenyl]-propionic acid methyl ester dihydrochloride were reacted according to General Procedures L and B. LCMS (m/z): 823.

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

Procedure: The title compound (15 mg) was prepared from (S)-2-tert-butoxycarbonylamino-3-{(S)-2-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester, which was deprotected according to General Procedure C, then treated with 2-methyl-3-pentanone according to General Procedure M. The reductive amination product was subjected to General Procedures V and B in succession, then the resulting acid and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yl)-phenyl]-propionic acid methyl ester dihydrochloride were reacted according to General Procedures L and B. LCMS (m/z): 823.

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

Procedure: The title compound (15 mg) was prepared from (S)-2-tert-butoxycarbonylamino-3-{(S)-2-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester, which was deprotected according to General Procedure C, then treated with 2-methyl-3-pentanone according to General Procedure M. The reductive amination product was subjected to General Procedures V and B in succession, then the resulting acid and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yl)-phenyl]-propionic acid methyl ester dihydrochloride were reacted according to General Procedures L and B. LCMS (m/z): 823.

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

Procedure: The title compound (15 mg) was prepared from (S)-2-tert-butoxycarbonylamino-3-{(S)-2-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester, which was deprotected according to General Procedure C, then treated with 2-methyl-3-pentanone according to General Procedure M. The reductive amination product was subjected to General Procedures V and B in succession, then the resulting acid and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yl)-phenyl]-propionic acid methyl ester dihydrochloride were reacted according to General Procedures L and B. LCMS (m/z): 823.

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

Procedure: The title compound (15 mg) was prepared from (S)-2-tert-butoxycarbonylamino-3-{(S)-2-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester, which was deprotected according to General Procedure C, then treated with 2-methyl-3-pentanone according to General Procedure M. The reductive amination product was subjected to General Procedures V and B in succession, then the resulting acid and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yl)-phenyl]-propionic acid methyl ester dihydrochloride were reacted according to General Procedures L and B. LCMS (m/z): 823.

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

Procedure: 100 g (948 mmol) of 2-methylpentan-3-one were dissolved in 400 ml of tert-butyl methyl ether. 50 g (274 mmol) of solution of hydrochloride in ethylene glycol dimethyl ether (20%) were added. Subsequently, a solution of 117 g (949 mmol) isoamyl nitrite in 150 ml of tert-butyl methyl ether was added dropwise within 60 minutes. The solvent was removed fully under reduced pressure. The residue was taken up in 300 ml of n-heptane and concentrated again under reduced pressure. After 200 ml of n-heptane had been added, extraction was effected with 522 ml of sodium hydroxide solution (2 molar). After phase separation, the aqueous phase was washed with n-heptane. The aqueous phase was acidified by adding conc. hydrochloric acid. The product was isolated by filtration with suction, washed with water and dried at elevated temperature under reduced pressure. The solvent was removed fully under reduced pressure concentrated again under reduced pressure After 200 ml of n-heptane had been added extraction After phase separation the aqueous phase was washed with n-heptane by adding conc. hydrochloric acid The product was isolated by filtration with suction washed with water dried at elevated temperature under reduced pressure

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

Procedure: 2-Methyl-3-pentanone (5 g, 49.9 mmol) and DMF-DMA (10 mL, 74.9 mmol) were heated together in a sealed tube for 4 days. The reaction was concentrated in vacuo to afford an orange oil that was used directly in the next reaction (1.64 g, 21%). The reaction was concentrated in vacuo to afford an orange oil that was used directly in the next reaction (1.64 g, 21%)

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

Procedure: 30 g of acrolein (boiling point about 105° C) are added dropwise in the course of 60 minutes to 150 g of ethyl isopropyl ketone and 2 g of p-toluenesulfonic acid, under reflux. The water formed is removed. After 3 hours, the unconverted starting materials are distilled off through a short column under atmospheric pressure at from 40° to 112° C. The reaction mixture ist then kept for 1 hour at an internal temperature of 200° C and is thereafter distilled under reduced pressure. 7 g of water, 3 g of acrolein, 122 g of ethyl isopropyl ketone, 22 g of 2,6,6-trimethyl-cyclohex-2-en-1-one (free from isomers) and 28 g of residue are obtained. This amounts to a yield of 57%, based on ethyl isopropyl ketone employed. under reflux is removed the unconverted starting materials are distilled off through a short column under atmospheric pressure at from 40° to 112° C The reaction mixture ist then kept for 1 hour at an internal temperature of 200° C is thereafter distilled under reduced pressure

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

Procedure: 100 g (948 mmol) of 2-methylpentan-3-one were dissolved in 400 ml of tert-butyl methyl ether. 50 g (274 mmol) of solution of hydrochloride in ethylene glycol dimethyl ether (20%) were added. Subsequently, a solution of 117 g (949 mmol) isoamyl nitrite in 150 ml of tert-butyl methyl ether was added dropwise within 60 minutes. The solvent was removed fully under reduced pressure. The residue was taken up in 300 ml of n-heptane and concentrated again under reduced pressure. After 200 ml of n-heptane had been added, extraction was effected with 522 ml of sodium hydroxide solution (2 molar). After phase separation, the aqueous phase was washed with n-heptane. The aqueous phase was acidified by adding conc. hydrochloric acid. The product was isolated by filtration with suction, washed with water and dried at elevated temperature under reduced pressure. The solvent was removed fully under reduced pressure concentrated again under reduced pressure After 200 ml of n-heptane had been added extraction After phase separation the aqueous phase was washed with n-heptane by adding conc. hydrochloric acid The product was isolated by filtration with suction washed with water dried at elevated temperature under reduced pressure

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

Procedure: The title compound (15 mg) was prepared from (S)-2-tert-butoxycarbonylamino-3-{(S)-2-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester, which was deprotected according to General Procedure C, then treated with 2-methyl-3-pentanone according to General Procedure M. The reductive amination product was subjected to General Procedures V and B in succession, then the resulting acid and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yl)-phenyl]-propionic acid methyl ester dihydrochloride were reacted according to General Procedures L and B. LCMS (m/z): 823.

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

Procedure: The title compound (15 mg) was prepared from (S)-2-tert-butoxycarbonylamino-3-{(S)-2-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester, which was deprotected according to General Procedure C, then treated with 2-methyl-3-pentanone according to General Procedure M. The reductive amination product was subjected to General Procedures V and B in succession, then the resulting acid and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yl)-phenyl]-propionic acid methyl ester dihydrochloride were reacted according to General Procedures L and B. LCMS (m/z): 823.

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

Procedure: The title compound (15 mg) was prepared from (S)-2-tert-butoxycarbonylamino-3-{(S)-2-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester, which was deprotected according to General Procedure C, then treated with 2-methyl-3-pentanone according to General Procedure M. The reductive amination product was subjected to General Procedures V and B in succession, then the resulting acid and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yl)-phenyl]-propionic acid methyl ester dihydrochloride were reacted according to General Procedures L and B. LCMS (m/z): 823.