(R)-(-)-2-Amino-1-propanol → 5-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-pyrazine-2-carboxylic acid ((S)-2-hydroxy-1-methyl-ethyl)-amide

HRID 600499Notes

Reaction equation

HRID 600499 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:12]([CH2:13][O:14][C:15]3[N:16]=[CH:17][C:18]([C:21]([OH:23])=O)=[N:19][CH:20]=3)=[CH:11][O:10][N:9]=2)=[CH:4][CH:3]=1.[NH2:24][C@@H:25]([CH2:27][OH:28])[CH3:26].O.ON1C2C=CC=CC=2N=N1.C(N(C(C)C)C(C)C)C.Cl.CN(C)CCCN=C=NCC>C1COCC1.O>[OH:28][CH2:27][C@@H:25]([NH:24][C:21]([C:18]1[CH:17]=[N:16][C:15]([O:14][CH2:13][C:12]2[C:8]([C:5]3[CH:4]=[CH:3][C:2]([Cl:1])=[CH:7][CH:6]=3)=[N:9][O:10][CH:11]=2)=[CH:20][N:19]=1)=[O:23])[CH3:26]

Participants

8

Reactant 5

HCID 80308(R)-(-)-2-Amino-1-propanolHCID 81531DiisopropylethylamineHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 27960291-Hydroxybenzotriazole hydrateHCID 684440725-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-pyrazine-2-carboxylic acid

Product 1

HCID 469379035-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-pyrazine-2-carboxylic acid ((S)-2-hydroxy-1-methyl-ethyl)-amideYield 42%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 5-[3-(4-chloro-phenyl)-isoxazol-4-ylmethoxy]-pyrazine-2-carboxylic acid (80 mg, 0.24 mmol) and D-alaninol (22.8 □L, 0.29 mmol) in THF (7 mL) was added 1-hydroxybenzotriazole hydrate (37.3 mg, 0.24 mmol), N-ethyldiisopropylamine (105.2 □L, 0.60 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (47.1 mg, 0.24 mmol) at room temperature under nitrogen. The reaction mixture was stirred at room temperature for 72 h. Then the reaction mixture was diluted with water (10 mL), and extracted with ethyl acetate. The combined organic layers were then washed with water and brine, dried over sodium sulfate and evaporated. Purification by chromatography (SiO2, heptane:ethyl acetate=1:1 to 2:3) afforded the title product (39 mg, 42%) which was obtained as white solid. MS: m/e=389.0 [M+H]+.

Workup

  1. extractionextracted with ethyl acetate
  2. washThe combined organic layers were then washed with water and brine
  3. dry with materialdried over sodium sulfate
  4. customevaporated
  5. customPurification by chromatography (SiO2, heptane:ethyl acetate=1:1 to 2:3)

Sources & evidence

ORD record
ord-33d878a95fb647a485567de844601b1f
Source dataset
uspto-grants-2011_03
Patent number
US07902201B2

Reaction notes

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