Phosphorus oxychloride → Ethyl 4-chloro-2-methylpyrimidine-5-carboxylate

HRID 1930386노트

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HRID 1930386 반응식
P(Cl)(Cl)([Cl:3])=O.O[C:7]1[C:12]([C:13]([O:15][CH2:16][CH3:17])=[O:14])=[CH:11][N:10]=[C:9]([CH3:18])[N:8]=1>C(N(CC)CC)C>[Cl:3][C:7]1[C:12]([C:13]([O:15][CH2:16][CH3:17])=[O:14])=[CH:11][N:10]=[C:9]([CH3:18])[N:8]=1

참가 물질

4

반응물 2

HCID 24813Phosphorus oxychlorideHCID 178469783HCID 178469783, 화합물

생성물 1

HCID 12677176Ethyl 4-chloro-2-methylpyrimidine-5-carboxylate수율 53%

시약·촉매·용매 1

HCID 8471Triethylamine용매

반응 조건

온도
40 °C

실험 절차

In cold (˜0° C.) phosphorous oxychloride (40 mL) was carefully added triethylamine (1.87 mL) with stirring. To this was added, in parts, ethyl 4-hydroxy-2-methylpyrimidine-5-carboxylate (5.00 g, 27.4 mmol). The mixture then warmed to 40° C. and stirred under Argon for 2 hours. The mixture was evaporated free of phosphorous oxychloride, diluted with chloroform (150 mL) and poured carefully into ice (400 mL) and allowed to warm to RT. The organic phase was separated, washed with saturated sodium bicarbonate (75 mL), then brine (100 mL) and dried over sodium sulfate. The solvents evaporated to give a thick oil which was purified by chromatography (Biotage Si-40 column, 15-40% ethyl acetate/hexane) to give ethyl 4-chloro-2-methylpyrimidine-5-carboxylate as a clear oil (2.96 g, 53% yield). 1H NMR (400 MHz, DMSO-d6): δ 1.31 (t, 3 H), 2.66 (s, 3 H), 4.34 (q, 2 H), 9.06 (s, 1 H); MS (ESI) m/z: 201.0 (M+H+).

후처리

  1. stirringstirred under Argon for 2 hours
  2. customThe mixture was evaporated free of phosphorous oxychloride
  3. additiondiluted with chloroform (150 mL)
  4. additionpoured carefully into ice (400 mL)
  5. temperatureto warm to RT
  6. customThe organic phase was separated
  7. washwashed with saturated sodium bicarbonate (75 mL)
  8. dry with materialbrine (100 mL) and dried over sodium sulfate
  9. customThe solvents evaporated
  10. customto give a thick oil which
  11. customwas purified by chromatography (Biotage Si-40 column, 15-40% ethyl acetate/hexane)

출처 및 근거

ORD 기록
ord-2b2f35e8fb4846e9a8ad201e00d0f4d2
출처 데이터셋
uspto-grants-2012_05
특허 번호
US08188113B2

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