1,1,3,3-Tetramethylguanidine → 2-(4-(6-(5,7-Dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)pyridin-2-yl)piperazin-1-yl)propanamide

HRID 1519420Notes

Reaction equation

HRID 1519420 reaction equation
Cl.Cl.[N:3]1([CH:9]([CH3:13])[C:10]([NH2:12])=[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.ClCCl>[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]([CH:9]([CH3:13])[C:10]([NH2:12])=[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 545934312-(Piperazin-1-yl)propanamide dihydrochlorideHCID 1364081482-(6-fluoropyridin-2-yl)-5,7-dimethoxyquinazolin-4(3H)-one

Product 1

HCID 1362488412-(4-(6-(5,7-Dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)pyridin-2-yl)piperazin-1-yl)propanamideYield 28%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 6344DichloromethaneSolvent

Procedure

To a suspension of 2-(piperazin-1-yl)propanamide dihydrochloride (0.305 g, 1.33 mmol) in DMSO (1.5 mL), was added 1,1,3,3,-tetramethylguanidine (0.398 g, 3.45 mmol) at rt. The reaction mixture was stirred for 15 min. After that time 2-(6-fluoropyridin-2-yl)-5,7-dimethoxyquinazolin-4(3H)-one (0.20 g, 0.664 mmol) was added as a solid in a single portion. The resulting mixture was stirred at 90° C. for 3.5 h. After that time the reaction was cooled to rt and diluted with dichloromethane (50 mL). The organic phase was washed with brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by flash column chromatography (silica gel, 93:7 dichloromethane/methanol) to give 2-(4-(6-(5,7-dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)pyridin-2-yl)piperazin-1-yl)propanamide (0.080 g, 28%) as a light yellow solid: mp 149-150° C.; 1H NMR (400 MHz, DMSO-d6) δ 11.05 (br s, 1H), 7.65-7.79 (m, 2H), 7.30 (s, 1H), 7.06 (d, J=8.20 Hz, 1H), 6.78 (s, 1H), 6.58 (s, 1H), 4.48 (br s, 1H), 3.91 (s, 3H), 3.86 (s, 3H), 3.64 (br s, 4H), 3.55 (br s, 2H), 2.54 (br s, 4H), 2.45 (t, 2H); ESI MS m/z 439 [M+H]+.

Workup

  1. stirringThe resulting mixture was stirred at 90° C. for 3.5 h
  2. washThe organic phase was washed with brine
  3. dry with materialdried over Na2SO4
  4. concentrationconcentrated under reduced pressure
  5. customThe residue was purified by flash column chromatography (silica gel, 93:7 dichloromethane/methanol)

Sources & evidence

ORD record
ord-cc07b535e28b4181869af29a916350cc
Source dataset
uspto-grants-2015_07
Patent number
US09073878B2

Reaction notes

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