Carbon tetrabromide → Benzyl 2-(2-bromoethyl)piperidine-1-carboxylate

HRID 2403800노트

반응식

HRID 2403800 반응식
O[CH2:2][CH2:3][CH:4]1[CH2:9][CH2:8][CH2:7][CH2:6][N:5]1[C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:11].C(Br)(Br)(Br)[Br:21].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>ClCCl>[Br:21][CH2:2][CH2:3][CH:4]1[CH2:9][CH2:8][CH2:7][CH2:6][N:5]1[C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:11]

참가 물질

5

반응물 3

HCID 11205Carbon tetrabromideHCID 11776TriphenylphosphineHCID 45358666Benzyl 2-(2-hydroxyethyl)piperidine-1-carboxylate

생성물 1

HCID 58306210Benzyl 2-(2-bromoethyl)piperidine-1-carboxylate수율 74.1%

시약·촉매·용매 1

HCID 6344Dichloromethane용매2회

실험 절차

To a solution of phenylmethyl 2-(2-hydroxyethyl)-1-piperidinecarboxylate (1.76 g, 6.70 mmol) in anhydrous dichloromethane (29 mL) was added carbon tetrabromide (4.44 g, 13.39 mmol). The resulting solution was cooled in ice/water. A solution of triphenylphosphine (1.76 g, 6.70 mmol) in 10 ml dry DCM was added dropwise over 30 mins. After complete addition the reaction was allowed to warm slowly to ambient temperature and stirring continued overnight. The reaction solution was reduced in volume to <10 ml (opaque) and this was loaded onto a 100 g silica cartridge and purified by chromatography on a Flashmaster 2 using a gradient of 0-25% ethyl acetate in cyclohexane over 40 minutes. Product fractions were combined and evaporated in vacuo to give the title compound as a colourless oil (1.62 g).

후처리

  1. additionAfter complete addition the reaction
  2. custompurified by chromatography on a Flashmaster 2 using a gradient of 0-25% ethyl acetate in cyclohexane over 40 minutes
  3. customevaporated in vacuo

출처 및 근거

ORD 기록
ord-a2f9634db9274a9e8174aa882ac46731
출처 데이터셋
uspto-grants-2014_08
특허 번호
US08802684B2

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