1,1,3,3-Tetramethylguanidine → Methyl 2-(4-(6-(5,7-dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)pyridin-2-yl)piperazin-1-yl)acetate

HRID 922365Notes

Reaction equation

HRID 922365 reaction equation
Cl.Cl.[N:3]1([CH2:9][C:10]([O:12][CH3:13])=[O:11])[CH2:8][CH2:7][NH:6][CH2:5][CH2:4]1.CN(C)C(N(C)C)=N.F[C:23]1[N:28]=[C:27]([C:29]2[NH:38][C:37](=[O:39])[C:36]3[C:31](=[CH:32][C:33]([O:42][CH3:43])=[CH:34][C:35]=3[O:40][CH3:41])[N:30]=2)[CH:26]=[CH:25][CH:24]=1>CS(C)=O.C(OCC)(=O)C>[CH3:41][O:40][C:35]1[CH:34]=[C:33]([O:42][CH3:43])[CH:32]=[C:31]2[C:36]=1[C:37](=[O:39])[NH:38][C:29]([C:27]1[N:28]=[C:23]([N:6]3[CH2:7][CH2:8][N:3]([CH2:9][C:10]([O:12][CH3:13])=[O:11])[CH2:4][CH2:5]3)[CH:24]=[CH:25][CH:26]=1)=[N:30]2

Participants

6

Reactant 3

HCID 664601,1,3,3-TetramethylguanidineHCID 53398818Methyl 2-(piperazin-1-yl)acetate dihydrochlorideHCID 1364081482-(6-fluoropyridin-2-yl)-5,7-dimethoxyquinazolin-4(3H)-one

Product 1

HCID 136248835Methyl 2-(4-(6-(5,7-dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)pyridin-2-yl)piperazin-1-yl)acetateYield 61.1%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a stirred suspension of methyl 2-(piperazin-1-yl)acetate dihydrochloride (0.67 g, 2.92 mmol) in dry DMSO (1.5 mL) was added 1,1,3,3-tetramethylguanidine (0.15 g, 1.07 mmol). The resulting mixture was stirred at rt for 10 min. Then 2-(6-fluoropyridin-2-yl)-5,7-dimethoxyquinazolin-4(3H)-one (0.40 g, 1.33 mmol) was added as a solid. The reaction was heated at 90° C. for 4.5 h. After that time the reaction was cooled to rt and diluted with ethyl acetate (30 mL). The organic phase was washed with water and brine, dried over sodium sulfate, filtered and concentrated under reduced pressure. The product was purified by flash column chromatography (silica gel, 98:2 dichloromethane/methanol) followed by trituration with diethyl ether to give methyl 2-(4-(6-(5,7-dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)pyridin-2-yl)piperazin-1-yl)acetate (0.357 g, 61%) as a light yellow solid: mp 176-177° C.; 1H NMR (400 MHz, CDCl3) δ 10.30 (br s, 1H), 7.86 (d, J=7.03 Hz, 1H), 7.63-7.71 (m, 1H), 6.80-6.86 (m, 2H), 6.48 (d, J=2.34 Hz, 1H), 3.99 (s, 3H), 3.94 (s, 3H), 3.77 (s, 3H), 3.67-3.73 (m, 4H), 3.34 (s, 2H), 2.73-2.79 (m, 4H); ESI MS m/z 440 [M+H]+.

Workup

  1. temperatureThe reaction was heated at 90° C. for 4.5 h
  2. temperatureAfter that time the reaction was cooled to rt
  3. washThe organic phase was washed with water and brine
  4. dry with materialdried over sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe product was purified by flash column chromatography (silica gel, 98:2 dichloromethane/methanol)

Sources & evidence

ORD record
ord-f698ae5453084977b1110d4f907b2c9e
Source dataset
uspto-grants-2016_03
Patent number
US09278940B2

Reaction notes

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