Glycol monoethyl ether → 5-[2-(2-Ethoxyethoxy)-5-(4-ethylpiperazin-1-ylsulphonyl)pyridin-3-yl]-3-ethyl-2-(pyridin-2-yl)methyl-2,6-dihydro-7h-pyrazolo[4,3-d]pyrimidin-7-one

HRID 1068665Notes

Reaction equation

HRID 1068665 reaction equation
C[Si]([N-][Si](C)(C)C)(C)C.[K+].[CH2:11]([O:13][C:14]1[C:19]([C:20]2[NH:21][C:22](=[O:38])[C:23]3[C:24](=[C:26]([CH2:36][CH3:37])[N:27]([CH2:29][C:30]4[CH:35]=[CH:34][CH:33]=[CH:32][N:31]=4)[N:28]=3)[N:25]=2)=[CH:18][C:17]([S:39]([N:42]2[CH2:47][CH2:46][N:45]([CH2:48][CH3:49])[CH2:44][CH2:43]2)(=[O:41])=[O:40])=[CH:16][N:15]=1)[CH3:12].[CH2:50]([O:52]CCO)[CH3:51]>>[CH2:50]([O:52][CH2:12][CH2:11][O:13][C:14]1[C:19]([C:20]2[NH:21][C:22](=[O:38])[C:23]3[C:24](=[C:26]([CH2:36][CH3:37])[N:27]([CH2:29][C:30]4[CH:35]=[CH:34][CH:33]=[CH:32][N:31]=4)[N:28]=3)[N:25]=2)=[CH:18][C:17]([S:39]([N:42]2[CH2:47][CH2:46][N:45]([CH2:48][CH3:49])[CH2:44][CH2:43]2)(=[O:40])=[O:41])=[CH:16][N:15]=1)[CH3:51]

Participants

4

Reactant 3

HCID 8076Glycol monoethyl ether2×HCID 3251421Potassium bis(trimethylsilyl)amideHCID 1355816594-{6-Ethoxy-5-[3-ethyl-6,7-dihydro-7-oxo-2-(2-pyridylmethyl)-2H-pyrazolo [4,3-d]pyrimidin-5-yl]-3-pyridylsulfonyl}-1-ethylpiperazine

Product 1

HCID 1358163605-[2-(2-Ethoxyethoxy)-5-(4-ethylpiperazin-1-ylsulphonyl)pyridin-3-yl]-3-ethyl-2-(pyridin-2-yl)methyl-2,6-dihydro-7h-pyrazolo[4,3-d]pyrimidin-7-oneYield 68%

Conditions

Temperature
90 °C

Procedure

A stirred mixture of potassium bis(trimethylsilyl)amide (434 mg, 2.2 mmol) and 2-ethoxyethanol (2 ml) was heated at 90° C. for 30 minutes, then allowed to cool. A solution of the title compound of Example 1 (153 mg, 0.27 mmol) in 2-ethoxyethanol (2 ml) was added and the reaction mixture stirred at 110° C. for 18 hours, then allowed to cool. The resulting mixture was evaporated under reduced pressure and the residual brown oil purified by column chromatography on silica gel, using dichloromethane: methanol (95:5) as eluant, to furnish the title compound (110 mg, 68%) as a yellow foam. δ (CDCl3): 1.04 (3H,t), 1.31 (6H,m), 2.41 (2H,q), 2.54 (4H,m), 3.04 (2H,q), 3.14 (4H,m), 3.72 (2H,q), 3.90 (2H,t), 4.78 (2H,t), 5.67 (2H,s), 7.10 (1H,d), 7.22 (1H,m), 7.63 (1H,m), 8.57 (1H,d), 8.62 (1H,s), 8.99 (1H,s), 10.78 (1H,s). LRMS: m/z 597 (M+1)+.

Workup

  1. temperatureto cool
  2. temperatureto cool
  3. customThe resulting mixture was evaporated under reduced pressure
  4. customthe residual brown oil purified by column chromatography on silica gel

Sources & evidence

ORD record
ord-4010950ef32f426ca3362041160d0e60
Source dataset
uspto-grants-2001_06
Patent number
US06251904B1

Reaction notes

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