Potassium Phosphate, Tribasic → 4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester

HRID 1850330Notes

Reaction equation

HRID 1850330 reaction equation
[NH:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[C:10]([N:12]1[CH2:15][CH:14]([C:16]2[C:21](Cl)=[N:20][CH:19]=[CH:18][N:17]=2)[CH2:13]1)=[O:11].[C:23]([O:27][C:28]([N:30]1[CH2:35][CH:34]=[C:33](B2OC(C)(C)C(C)(C)O2)[CH2:32][CH2:31]1)=[O:29])([CH3:26])([CH3:25])[CH3:24].[O-]P([O-])([O-])=O.[K+].[K+].[K+]>O1CCOCC1.O.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[C:23]([O:27][C:28]([N:30]1[CH2:31][CH:32]=[C:33]([C:21]2[C:16]([CH:14]3[CH2:15][N:12]([C:10]([C:2]4[NH:3][C:4]5[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=5[N:1]=4)=[O:11])[CH2:13]3)=[N:17][CH:18]=[CH:19][N:20]=2)[CH2:34][CH2:35]1)=[O:29])([CH3:26])([CH3:24])[CH3:25]

Participants

6

Reactant 3

HCID 62657Potassium Phosphate, TribasicHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylateHCID 58546731(1H-benzoimidazol-2-yl)-[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-methanone

Product 1

HCID 585468644-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl esterYield 80%

Reagents, catalysts & solvents 2

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 218864351,4-Dioxane--water (1/1)Solvent

Procedure

To a mixture of (1H-Benzoimidazol-2-yl)-[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-methanone (188 mg, 0.6 mmol) in 1,4-dioxane/water (5:1, 12 mL) was added 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (278 mg, 0.9 mmol), K3PO4 (254 mg, 1.2 mmol) and Pd(dppf)Cl2 (44 mg, 0.06 mmol). The mixture was refluxed overnight. The reaction mixture was filtered and concentrated. The residue was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) to give 4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (221 mg, 0.48 mmol, yield 80%). ESI-MS (M+1): 461 calc. for C25H28N6O3 460.

Workup

  1. temperatureThe mixture was refluxed overnight
  2. filtrationThe reaction mixture was filtered
  3. concentrationconcentrated
  4. customThe residue was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether)

Sources & evidence

ORD record
ord-35e397b519c34cfda3b01f3b650ad715
Source dataset
uspto-grants-2015_02
Patent number
US08957073B2

Reaction notes

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