Diisopropylamine → 7a-(2,6-Difluoro-3-pyridinyl)-hexahydro-1h-pyrrolizine

HRID 3293

반응식

HRID 3293 반응식
[Li]CCCC.C(NC(C)C)(C)C.[F:13][C:14]1[CH:19]=[CH:18][CH:17]=[C:16]([F:20])[N:15]=1.Cl([O-])(=O)(=O)=O.[CH2:26]1[C:33]2[CH2:32][CH2:31][CH2:30][N+:29]=2[CH2:28][CH2:27]1>C1COCC1>[F:13][C:14]1[C:19]([C:33]23[CH2:32][CH2:31][CH2:30][N:29]2[CH2:28][CH2:27][CH2:26]3)=[CH:18][CH:17]=[C:16]([F:20])[N:15]=1

참가 물질

6

반응물 4

HCID 7912DiisopropylamineHCID 739342,6-DifluoropyridineHCID 10878400Pyrrolizinium, 1,2,3,5,6,7-hexahydro-, perchlorateHCID 178418339Butyllithium

생성물 1

HCID 189347437a-(2,6-Difluoro-3-pyridinyl)-hexahydro-1h-pyrrolizine수율 50.2%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

반응 조건

온도
-78 °C

실험 절차

A solution of 2.5M nBuLi (675 μL, 1.7 mmol) in hexanes was added to diisopropylamine (220 μL, 1.6 mmol) in THF (4.5 mL) at ambient temperature. After 10 minutes of stirring, the reaction mixture was cooled to -78° C., 2,6-difluoropyridine (145 μL, 1.6 mmol) was introduced, and stirring was continued for 1 hour at -78° C. 1,2,3,5,6,7-hexahydropyrrolizinium perchlorate (500 mg, 2.4 mmol) was then added, and the cold bath was removed. After warming to ambient temperature, a solution of 2N HCl was added and the phases were separated after pouting the reaction mixture over EtOAc. The aqueous phase was basified with 15% NaOH solution and extracted with CH2Cl2 (2×). The CH2Cl2 extracts were combined, dried (MgSO4), concentrated and chromatographed (silica gel; CHCl3 /MeOH, 98:2) to afford a clear oil (180 mg, 50%). MS (CI/NH3) m/e: 225 (M+H)+. 1H NMR (CDCl3, 300 MHz) δ1.5-1.63 (m, 2H), 1.78-1.89 (m, 2H), 1.92-2.10 (m, 4H), 2.63-2.70 (m, 2H), 3.08-3.12 (m, 2H), 6.72 (dd, J=8.1, 3.0 Hz, 1H), 8.33 (dd, J=18.0, 8.1 Hz, 1H).

후처리

  1. stirringstirring
  2. waitwas continued for 1 hour at -78° C
  3. customthe cold bath was removed
  4. temperatureAfter warming to ambient temperature
  5. additiona solution of 2N HCl was added
  6. customthe phases were separated
  7. extractionextracted with CH2Cl2 (2×)
  8. dry with materialdried (MgSO4)
  9. concentrationconcentrated
  10. customchromatographed (silica gel; CHCl3 /MeOH, 98:2)

출처 및 근거

ORD 기록
ord-d55b4270d2e84321a49a35cd7ef17438
출처 데이터셋
uspto-grants-1998_03
특허 번호
US05733912

연결된 노트

불러오는 중…