Triethylamine → (R)-1-[4-(1-Methyl-3-oxo-2-quinoxalin-2-yl-1,2,3,4,6,7-hexahydro-pyrazolo[4,3-c]pyridin-5-yl)-pyrimidin-2-yl]-ethyl butyrate

HRID 394513Notes

Reaction equation

HRID 394513 reaction equation
Cl.[CH3:2][N:3]1[C:11]2[CH2:10][CH2:9][NH:8][CH2:7][C:6]=2[C:5](=[O:12])[N:4]1[C:13]1[CH:22]=[N:21][C:20]2[C:15](=[CH:16][CH:17]=[CH:18][CH:19]=2)[N:14]=1.[C:23]([O:28][C@@H:29]([C:31]1[N:36]=[C:35](Cl)[CH:34]=[CH:33][N:32]=1)[CH3:30])(=[O:27])[CH2:24][CH2:25][CH3:26].C(N(CC)CC)C>C(O)(C)C>[C:23]([O:28][C@@H:29]([C:31]1[N:32]=[C:33]([N:8]2[CH2:9][CH2:10][C:11]3[N:3]([CH3:2])[N:4]([C:13]4[CH:22]=[N:21][C:20]5[C:15](=[CH:16][CH:17]=[CH:18][CH:19]=5)[N:14]=4)[C:5](=[O:12])[C:6]=3[CH2:7]2)[CH:34]=[CH:35][N:36]=1)[CH3:30])(=[O:27])[CH2:24][CH2:25][CH3:26]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 10944226(R)-1-(4-chloro-pyrimidin-2-yl)ethyl butyrateHCID 223287161-Methyl-2-quinoxalin-2-yl-1,2,4,5,6,7-hexahydro-pyrazolo[4,3-c]pyridin-3-one hydrochloride

Product 1

HCID 20767623(R)-1-[4-(1-Methyl-3-oxo-2-quinoxalin-2-yl-1,2,3,4,6,7-hexahydro-pyrazolo[4,3-c]pyridin-5-yl)-pyrimidin-2-yl]-ethyl butyrateYield 95%

Reagents, catalysts & solvents 1

HCID 3776IsopropanolSolvent

Procedure

To a stirred solution of 1-methyl-2-quinoxalin-2-yl-1,2,4,5,6,7-hexahydro-pyrazolo[4,3-c]pyridin-3-one hydrochloride (prepared according to the method of Example 75, Step C, 175 mg, 0.55 mmol) and (R)-1-(4-chloro-pyrimidin-2-yl)-ethyl butyrate (prepared according to the method of Preparation Seven, 126 mg, 0.55 mmol) in isopropanol (6 mL) was added triethylamine (230 μL, 1.66 mmol). This mixture was heated to reflux overnight, cooled to room temperature, and evaporated. The residue was diluted with saturated aqueous sodium bicarbonate and extracted with chloroform (3×). The combined organic extracts were dried over sodium sulfate, filtered, evaporated, and purified by flash column chromatography (1.5% methanol/chloroform) to give 248 mg (95%) of the title compound of Example 75, Step D as a yellow oil. 1H NMR (CDCl3, 250 MHz) δ 9.70 (s, 1H), 8.29 (d, 1H), 8.15 (dd, 1H), 8.03 (m, 1H), 7.82-7.70 (c, 2H), 6.48 (d, 1H) 5.72 (q, 1H), 4.36 (s, 2H), 4.35-4.15 (c, 2H), 3.42 (s, 3H), 2.77-2.82 (c, 2H), 2.43 (t, 2H), 1.79-1.60 (c, 2H), 1.61 (d, 3H), 0.99 (t, 3H); MS (APCI) 474 (MH+).

Workup

  1. customprepared
  2. temperatureThis mixture was heated
  3. temperatureto reflux overnight
  4. customevaporated
  5. additionThe residue was diluted with saturated aqueous sodium bicarbonate
  6. extractionextracted with chloroform (3×)
  7. dry with materialThe combined organic extracts were dried over sodium sulfate
  8. filtrationfiltered
  9. customevaporated
  10. custompurified by flash column chromatography (1.5% methanol/chloroform)

Sources & evidence

ORD record
ord-23f92585e22e4e2397dede0f7c33726a
Source dataset
uspto-grants-2003_08
Patent number
US06602875B2

Reaction notes

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