Diisopropylethylamine → (S)-4-Methyl-2-[4-(1-methyl-1H-indazol-4-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid [1-((R)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl)-1H-pyrazol-3-yl]-amide

HRID 19386Notes

Reaction equation

HRID 19386 reaction equation
[CH3:1][CH:2]([CH3:25])[CH2:3][C@H:4]([N:8]1[CH2:12][C:11]([O:13][C:14]2[CH:22]=[CH:21][CH:20]=[C:19]3[C:15]=2[CH:16]=[N:17][N:18]3[CH3:23])=[CH:10][C:9]1=[O:24])[C:5](O)=[O:6].[CH3:26][C:27]1([CH3:39])[O:31][C@H:30]([CH2:32][N:33]2[CH:37]=[CH:36][C:35]([NH2:38])=[N:34]2)[CH2:29][O:28]1.C(N(CC)C(C)C)(C)C.F[P-](F)(F)(F)(F)F.N1(O[P+](N(C)C)(N(C)C)N(C)C)C2C=CC=CC=2N=N1>ClCCl.O>[CH3:26][C:27]1([CH3:39])[O:31][C@H:30]([CH2:32][N:33]2[CH:37]=[CH:36][C:35]([NH:38][C:5](=[O:6])[C@@H:4]([N:8]3[CH2:12][C:11]([O:13][C:14]4[CH:22]=[CH:21][CH:20]=[C:19]5[C:15]=4[CH:16]=[N:17][N:18]5[CH3:23])=[CH:10][C:9]3=[O:24])[CH2:3][CH:2]([CH3:25])[CH3:1])=[N:34]2)[CH2:29][O:28]1

Participants

7

Reactant 4

HCID 81531DiisopropylethylamineHCID 151348Benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphateHCID 59344941(R)-1-((2,2-Dimethyl-1,3-dioxolan-4-yl)methyl)-1H-pyrazol-3-amineHCID 66899437HCID 66899437, compound

Product 1

HCID 86635243(S)-4-Methyl-2-[4-(1-methyl-1H-indazol-4-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid [1-((R)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl)-1H-pyrazol-3-yl]-amideYield 57%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6344DichloromethaneSolvent2×

Procedure

A solution of (S)-4-methyl-2-[4-(1-methyl-1H-indazol-4-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid methyl ester (30 mg, 0.08 mmol) in tetrahydrofuran (5 mL) and water (1 mL) was treated with lithium hydroxide monohydrate (3.6 mg 0.08 mmol). The mixture was stirred at room temperature for 3.5 h and then partitioned between ethyl acetate and water. The aqueous phase was acidified with 1N aqueous hydrochloric acid (pH=1), and extracted with ethyl acetate. The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo to afford (S)-4-methyl-2-[4-(1-methyl-1H-indazol-4-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid as an off-white solid. A mixture of (S)-4-methyl-2-[4-(1-methyl-1H-indazol-4-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid in dichloromethane (5 mL) was treated with 1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl-methyl)-1H-pyrazol-3-ylamine (prepared as in Example 49, 0.025 g, 0.13 mmol), N,N-diisopropylethylamine (0.033 g, 0.26 mmol) and benzotriazol-1-yl-oxy-tris(dimethylamino)phosphonium hexafluorophosphate (0.056 g, 0.13 mmol) at 0° C. The reaction mixture was allowed to warm to room temperature and stirred for 3.5 h. The mixture was partioned between dichloromethane and water. The organic layer was collected and concentrated in vacuo and the residue was purified by flash column chromatography (silica gel, 20% to 100% ethyl acetate/hexanes) which afforded (S)-4-Methyl-2-[4-(1-methyl-1H-indazol-4-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid [1-((R)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl)-1H-pyrazol-3-yl]-amide (0.025 g, 57%) as an off-white solid.

Workup

  1. customThe organic layer was collected
  2. concentrationconcentrated in vacuo
  3. customthe residue was purified by flash column chromatography (silica gel, 20% to 100% ethyl acetate/hexanes) which

Sources & evidence

ORD record
ord-f2f0691c6cd84939b24f555818af70b5
Source dataset
uspto-grants-2010_06
Patent number
US07741327B2

Reaction notes

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