Ethyl 4-piperidinecarboxylate → 1-[2-Fluoro-5-(4-oxo-3,4-dihydrophthalazin-1-ylmethyl)benzoyl]piperidine-4-carboxylic acid

HRID 1443891Notes

Reaction equation

HRID 1443891 reaction equation
[F:1][C:2]1[CH:10]=[CH:9][C:8]([CH2:11][C:12]2[C:21]3[C:16](=[CH:17][CH:18]=[CH:19][CH:20]=3)[C:15](=[O:22])[NH:14][N:13]=2)=[CH:7][C:3]=1[C:4](O)=[O:5].[NH:23]1[CH2:33][CH2:32][CH:26]([C:27]([O:29]CC)=[O:28])[CH2:25][CH2:24]1.F[P-](F)(F)(F)(F)F.N1(OC(N(C)C)=[N+](C)C)C2C=CC=CC=2N=N1.C(N(CC)C(C)C)(C)C>O.CC(N(C)C)=O>[F:1][C:2]1[CH:10]=[CH:9][C:8]([CH2:11][C:12]2[C:21]3[C:16](=[CH:17][CH:18]=[CH:19][CH:20]=3)[C:15](=[O:22])[NH:14][N:13]=2)=[CH:7][C:3]=1[C:4]([N:23]1[CH2:33][CH2:32][CH:26]([C:27]([OH:29])=[O:28])[CH2:25][CH2:24]1)=[O:5]

Participants

7

Reactant 4

HCID 70770Ethyl 4-piperidinecarboxylateHCID 81531DiisopropylethylamineHCID 2733084Methanaminium, N-((1H-benzotriazol-1-yloxy)(dimethylamino)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 248117402-Fluoro-5-[(4-oxo-3,4-dihydrophthalazin-1-yl)methyl]benzoic acid

Product 1

HCID 598335041-[2-Fluoro-5-(4-oxo-3,4-dihydrophthalazin-1-ylmethyl)benzoyl]piperidine-4-carboxylic acid

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 31374DimethylacetamideSolvent

Procedure

2-Fluoro-5-(4-oxo-3,4-dihydrophthalazin-1-ylmethyl)benzoic acid (B)(3.1 g, 0.14 mol), ethyl isonipecotate (1.7 ml, 0.11 mol), 2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HBTU) (5.1 g, 0.13 mol) and N,N,-diisopropylethylamine (10.0 ml, 0.55 mol) were added to dimethylacetamide (15 ml) and stirred for 18 hours. Water (100 ml) was added to the reaction mixture and the product was extracted into dichloromethane (4×50 ml). The combined organic layers were, filtered, washed with water (3×100 ml), dried over MgSO4, filtered and evaporated in vacuo to yield an orange oil. The oil was purified by flash chromatography (ethyl acetate) to yield 1-[2-fluoro-5-(4-oxo-3,4-dihydrophthalazin-1-ylmethyl)benzoyl]piperidine-4-carboxylic acid as the methyl ester (1.5 g, 33%, 96% purity). To a solution of the methyl ester in tetrahydrofuran: water (2:1, 40 ml) was added sodium hydroxide (0.3 g, 0.075 mol) and the reaction was stirred for 18 h. The reaction was concentrated, washed with ethyl acetate (2×20 ml) and acidified with 2M HCl to pH 2. The aqueous layer was extracted with dichloromethane (2×20 ml), and the combined extracts were dried over MgSO4 and evaporated to yield 1-[3-(4-oxo-3,4-dihydrophthalazin-1-ylmethyl)benzoyl]piperidine-4-carboxylic acid (D) as a yellow solid (0.6 g, 65%), m/z [M+1]+ 392 (96% purity)

Workup

  1. extractionthe product was extracted into dichloromethane (4×50 ml)
  2. filtrationfiltered
  3. washwashed with water (3×100 ml)
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. customevaporated in vacuo
  7. customto yield an orange oil
  8. customThe oil was purified by flash chromatography (ethyl acetate)

Sources & evidence

ORD record
ord-a3514f8d7e9d46b7bbf49f757cd3707a
Source dataset
uspto-grants-2010_02
Patent number
US07662818B2

Reaction notes

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