Trifluoroacetic acid → 4-(3,3-Difluoroazetidin-1-yl)piperidine

HRID 2066517노트

반응식

HRID 2066517 반응식
C(OC([N:8]1[CH2:13][CH2:12][CH:11]([N:14]2[CH2:17][C:16]([F:19])([F:18])[CH2:15]2)[CH2:10][CH2:9]1)=O)(C)(C)C.C(O)(C(F)(F)F)=O>C(Cl)Cl>[F:19][C:16]1([F:18])[CH2:17][N:14]([CH:11]2[CH2:10][CH2:9][NH:8][CH2:13][CH2:12]2)[CH2:15]1

참가 물질

4

반응물 2

HCID 6422Trifluoroacetic acidHCID 59606191tert-Butyl 4-(3,3-difluoroazetidin-1-yl)piperidine-1-carboxylate

생성물 1

HCID 596056804-(3,3-Difluoroazetidin-1-yl)piperidine수율 77%

시약·촉매·용매 1

HCID 6344Dichloromethane용매

실험 절차

To a solution of 4-oxo-piperidine-1-carboxylic acid tert-butyl ester (1.0 g, 5.0 mmol) in DCE (50 mL) was added 3,3-difluoroazetidine hydrochloride (712 mg, 5.5 mmol). The mixture was stirred at RT for 15 min, then sodium triacetoxyborohydride (1.59 g, 7.5 mmol) was added and stirring was continued for 17 h. The reaction mixture was diluted with brine and extracted with DCM. The organic layer was separated, dried (Na2SO4) and concentrated in vacuo. The resultant residue was purified by column chromatography to give 4-(3,3-difluoroazetidin-1-yl)-piperidine-1-carboxylic acid tert-butyl ester as a pale yellow solid (1.2 g, 88%). To a solution of 4-(3,3-difluoro-azetidin-1-yl)-piperidine-1-carboxylic acid tert-butyl ester (552 mg, 2.0 mmol) in DCM (4 mL) was added TFA (2 mL) and the resulting mixture was stirred at RT for 45 min. The reaction mixture was loaded onto an Isolute® SCX-2 cartridge. The cartridge was washed with MeOH then eluted with 2 M NH3 in MeOH to give the title compound as a pale yellow solid (271 mg, 77%).

후처리

  1. washThe cartridge was washed with MeOH
  2. washthen eluted with 2 M NH3 in MeOH

출처 및 근거

ORD 기록
ord-a433c89a31954b1090d921f67320a7d7
출처 데이터셋
uspto-grants-2012_10
특허 번호
US08293735B2

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