4-Methylmorpholine → 3-Benzyloxycarbonylamino-succinamic acid tert-butyl ester

HRID 1814342노트

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HRID 1814342 반응식
[C:1]([O:5][C:6](=[O:23])[CH2:7][C@H:8]([NH:12][C:13]([O:15][CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)=[O:14])[C:9](O)=[O:10])([CH3:4])([CH3:3])[CH3:2].C[N:25]1CCOCC1.[OH-].[NH4+]>C(Cl)Cl>[C:1]([O:5][C:6](=[O:23])[CH2:7][CH:8]([NH:12][C:13]([O:15][CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)=[O:14])[C:9]([NH2:25])=[O:10])([CH3:4])([CH3:3])[CH3:2]

참가 물질

5

반응물 3

HCID 79724-MethylmorpholineHCID 14923Ammonium HydroxideHCID 1110824-tert-Butyl hydrogen N-((phenylmethoxy)carbonyl)-L-aspartate

생성물 1

HCID 27287123-Benzyloxycarbonylamino-succinamic acid tert-butyl ester수율 95%

시약·촉매·용매 1

HCID 6344Dichloromethane용매

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온도
-10 °C

실험 절차

To a solution of (S)-2-benzyloxycarbonylamino-succinic acid-4-tert-butyl ester (20.0 g, 61.9 mmol) in CH2Cl2 (100 mL) at −10° C. in a salt/ice/water bath was added N-methylmorpholine (8.20 mL, 74.20 mmol). This was followed by dropwise addition of isobutyl chlorofomate (9.63 mL, 74.20 mmol), over 20 min. After 30 min of stirring at −10° C., ammonium hydroxide solution (28% w/w ammonia, 100 mL) was added portionwise over 5 min. The reaction mixture was stirred for another 8 h then followed by removal of the CH2Cl2 in vacuo. The remaining solution was extracted with EtOAc. The combined extracts were washed with 100 mL of each of the following: 5% citric acid, saturated NaHCO3, and brine. Drying and removal of solvents under vacuum gave crude oil which crystallized from Et2O/hexanes mixture. 3-benzyloxycarbonylamino-succinamic acid tert-butyl ester was obtained in 95% yield (19.0 g). MS (APCI) m/z 323.2 (M+1).

후처리

  1. additionThis was followed by dropwise addition of isobutyl chlorofomate (9.63 mL, 74.20 mmol), over 20 min
  2. stirringThe reaction mixture was stirred for another 8 h
  3. customthen followed by removal of the CH2Cl2 in vacuo
  4. extractionThe remaining solution was extracted with EtOAc
  5. washThe combined extracts were washed with 100 mL of each of the following: 5% citric acid, saturated NaHCO3, and brine
  6. customDrying
  7. customremoval of solvents under vacuum
  8. customgave crude oil which
  9. customcrystallized from Et2O/hexanes mixture

출처 및 근거

ORD 기록
ord-5760ac771da1422bbb4623f74fbd72ee
출처 데이터셋
uspto-grants-2005_04
특허 번호
US06875765B2

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