O-ethylhydroxylamine hydrochloride → N-Ethoxy-5-(2-fluoro-4-iodophenylamino)imidazo[1,5-a]pyrazine-6-carboxamide

HRID 2064037노트

반응식

HRID 2064037 반응식
CO[C:3]([C:5]1[N:6]=[CH:7][C:8]2[N:9]([CH:20]=[N:21][CH:22]=2)[C:10]=1[NH:11][C:12]1[CH:17]=[CH:16][C:15]([I:18])=[CH:14][C:13]=1[F:19])=[O:4].Cl.[CH2:24]([O:26][NH2:27])[CH3:25].C[Si](C)(C)[N-][Si](C)(C)C.[Li+]>C1COCC1>[CH2:24]([O:26][NH:27][C:3]([C:5]1[N:6]=[CH:7][C:8]2[N:9]([CH:20]=[N:21][CH:22]=2)[C:10]=1[NH:11][C:12]1[CH:17]=[CH:16][C:15]([I:18])=[CH:14][C:13]=1[F:19])=[O:4])[CH3:25]

참가 물질

5

반응물 3

HCID 76850O-ethylhydroxylamine hydrochloride2회HCID 2733832Lithium Hexamethyldisilazide2회HCID 591401715-(2-Fluoro-4-iodo-phenylamino)-imidazo[1,5-a]pyrazine-6-carboxylic acid methyl ester

생성물 1

HCID 44135982N-Ethoxy-5-(2-fluoro-4-iodophenylamino)imidazo[1,5-a]pyrazine-6-carboxamide수율 19.1%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

실험 절차

To a solution of 5-(2-fluoro-4-iodo-phenylamino)-imidazo[1,5-a]pyrazine-6-carboxylic acid methyl ester (165.0 mg, 0.40 mmol) and O-ethylhydroxylamine hydrochloride (78.1 mg, 0.80 mmol, 2.0 eq) in anhydrous THF (9.4 mL) at 0° C. was added lithium hexamethyldisilazide (1M in THF, 1.2 mL, 1.2 mmol, 3.0 eq). After stirring at room temperature for 16 h, additional O-ethylhydroxylamine hydrochloride (234.3 mg, 2.40 mmol, 3.0 eq) and lithium hexamethyldisilazide (1M in THF, 3.6 mL, 3.6 mmol, 9.0 eq) were added at 0° C., and the reaction mixture was stirred at room temperature for 3 days. The reaction mixture was then quenched with saturated aqueous solution of sodium bicarbonate (5 mL) and diluted with ethyl acetate (50 mL). The organic layer was isolated and washed with water and brine, dried (Na2SO4), filtered and concentrated in vacuo. The resultant residue was subjected to flash chromatography (Si-PPC, gradient 45% to 100%, ethyl acetate in hexane, followed by gradient 0 to 15% methanol in ethyl acetate) to give an oil. Crystallization from DCM—ether—hexane afforded the title compound as a yellow solid (33.7 mg, 19.1%). 1H NMR (DMSO-d6, 400 MHz) δ ppm 11.86 (s, 1H), 10.38 (s, 1H), 8.82 (s, 1H), 7.94 (s, 1H), 7.92 (s, 1H), 7.73 (d, J=10.4 Hz, 1H), 7.44 (d, 8.4 Hz, 1H), 6.57 (t, J=8.4 Hz, 1H), 3.90 (q, J=7.2 Hz, 2H), 1.18 (t, J=6.8 Hz, 3H); LCMS (method D2): RT=1.24 min, [M+H]+=442.

후처리

  1. stirringthe reaction mixture was stirred at room temperature for 3 days
  2. customThe reaction mixture was then quenched with saturated aqueous solution of sodium bicarbonate (5 mL)
  3. additiondiluted with ethyl acetate (50 mL)
  4. customThe organic layer was isolated
  5. washwashed with water and brine
  6. dry with materialdried (Na2SO4)
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo
  9. customto give an oil
  10. customCrystallization from DCM—ether—hexane

출처 및 근거

ORD 기록
ord-2352c23ad6014bbd9902fb0aad9ce97b
출처 데이터셋
uspto-grants-2012_10
특허 번호
US08288408B2

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