Allyl bromide → Cyclopropanecarboxylic acid, 1-(2-propenyl)-, 1,1-dimethylethyl ester

HRID 501346

반응식

HRID 501346 반응식
C([N-][CH:5]([CH3:7])[CH3:6])(C)C.[Li+].C(NC(C)C)(C)C.C([Li])CCC.[C:21]([O:25][C:26]([CH:28]1[CH2:30][CH2:29]1)=[O:27])([CH3:24])([CH3:23])[CH3:22].C(Br)C=C.[Cl-].[NH4+]>C1COCC1>[C:21]([O:25][C:26]([C:28]1([CH2:7][CH:5]=[CH2:6])[CH2:30][CH2:29]1)=[O:27])([CH3:24])([CH3:23])[CH3:22]

참가 물질

8

반응물 6

HCID 7841Allyl bromideHCID 7912DiisopropylamineHCID 25517Ammonium ChlorideHCID 2724682Lithium diisopropylamideHCID 13676038tert-Butyl cyclopropanecarboxylateHCID 178418339Butyllithium

생성물 1

HCID 546367Cyclopropanecarboxylic acid, 1-(2-propenyl)-, 1,1-dimethylethyl ester

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매3회

반응 조건

온도
0 °C

실험 절차

Lithium diisopropyl amide was generated from 7.5 g (58.1 mmol) diisopropyl amine and 23.2 mL of 2.5 M n-butyl lithium in 200 mL THF at 0° C. under nitrogen. After stirring for 30 minutes at 0° C. the solution was taken to −78° C. where 7.5 g (52.8 mmol) of cyclopropanecarboxylic acid tert-butyl ester in 30 mL of THF was added dropwise over 5 min. After 4 h 12.8 g (106 mmol) of allyl bromide in 30 mL THF was added drop-wise over 10 min. to the clear golden solution. The reaction was allowed to slowly warm to room temperature. After 19 hours the reaction was poured into aqueous saturated ammonium chloride solution, extracted with ether, dried and concentrated to deliver an oil which was purified via Kugelrohr distillation (approx. 20 mm Hg; 60-75° C. oven) to deliver 5.4 g (56%) of the desired product as a clear colorless oil.

후처리

  1. customwas taken to −78° C.
  2. additionwas added dropwise over 5 min
  3. temperatureto slowly warm to room temperature
  4. extractionextracted with ether
  5. customdried
  6. concentrationconcentrated
  7. distillationwas purified via Kugelrohr distillation (approx. 20 mm Hg; 60-75° C. oven)

출처 및 근거

ORD 기록
ord-cd50aaf9d15340dab3af8fe37511a97a
출처 데이터셋
uspto-grants-2010_08
특허 번호
US07772252B2

연결된 노트

불러오는 중…