Acetone → methyl 2-[(3R,4R)-3-(1-benzyloxycarbonyloxy-1-methylethyl)-3-isocyano-2-oxo-4-allylazetidin-1-yl]-3-methylbut-2-enoate

HRID 1719322노트

반응식

HRID 1719322 반응식
[N+:1]([C@@H:3]1[C@@H:6]([CH2:7][CH:8]=[CH2:9])[N:5]([C:10](=[C:15]([CH3:17])[CH3:16])[C:11]([O:13][CH3:14])=[O:12])[C:4]1=[O:18])#[C-:2].C([Li])CCC.[CH3:24][C:25]([CH3:27])=[O:26].Cl[C:29]([O:31][CH2:32][C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1)=[O:30]>O1CCCC1.C(O)(=O)C>[CH2:32]([O:31][C:29]([O:26][C:25]([C@:3]1([N+:1]#[C-:2])[C@@H:6]([CH2:7][CH:8]=[CH2:9])[N:5]([C:10](=[C:15]([CH3:17])[CH3:16])[C:11]([O:13][CH3:14])=[O:12])[C:4]1=[O:18])([CH3:27])[CH3:24])=[O:30])[C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1

참가 물질

7

반응물 4

HCID 180AcetoneHCID 10387Benzyl chloroformateHCID 54071546methyl 2-[(3R,4R)-3-isocyano-2-oxo-4-allylazetidin-1-yl]-3-methylbut-2-enoateHCID 178418339Butyllithium

생성물 1

HCID 18599215methyl 2-[(3R,4R)-3-(1-benzyloxycarbonyloxy-1-methylethyl)-3-isocyano-2-oxo-4-allylazetidin-1-yl]-3-methylbut-2-enoate

시약·촉매·용매 2

HCID 176Acetic Acid용매HCID 8028Tetrahydrofuran용매3회

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온도
-78 °C

실험 절차

To a solution of methyl 2-[(3R,4R)-3-isocyano-2-oxo-4-allylazetidin-1-yl]-3-methylbut-2-enoate (198.0 mg) in tetrahydrofuran (3.96 ml) was added dropwise a solution of n-butyl lithium (0.634 ml of 1.51M solution in hexane) at -78° C. over a period of 5 minutes. After stirring for 15 minutes at -78° C., the reaction mixture was added with a solution of acetone (0.0713 ml) in tetrahydrofuran (0.642 ml) at -78° C. over a period of 5 minutes. After stirring for 25 minutes at -78° C., the reaction mixture was added dropwise with a solution of benzyl chloroformate (0.1274 ml) in tetrahydrofuran (1.15 ml) at -78° C. over a period of 5 minutes. The resulting solution was allowed to warm to 0° C. over a period of 40 minutes and added with acetic acid (0.0639 ml) at 0° C. The solvent was distilled off in vacuo at 0° C. and the residue was dissolved in ethyl acetate (30 ml) and washed with brine, aqueous sodium bicarbonate, brine, and saturated aqueous sodium chloride. After drying over magnesium sulfate, the ethyl acetate extract was filtered and evaporated in vacuo. The residual oil (381.2 mg) was chromatographed on silica gel (11 g) eluting with a mixture of ethyl acetate and hexane (1:10→1:5) to give methyl 2-[(3R,4R)-3-(1-benzyloxycarbonyloxy-1-methylethyl)-3-isocyano-2-oxo-4-allylazetidin-1-yl]-3-methylbut-2-enoate (221.2 mg) as an oil.

후처리

  1. stirringAfter stirring for 25 minutes at -78° C.
  2. temperatureto warm to 0° C. over a period of 40 minutes
  3. distillationThe solvent was distilled off in vacuo at 0° C.
  4. dissolutionthe residue was dissolved in ethyl acetate (30 ml)
  5. washwashed with brine, aqueous sodium bicarbonate, brine, and saturated aqueous sodium chloride
  6. dry with materialAfter drying over magnesium sulfate
  7. extractionthe ethyl acetate extract
  8. filtrationwas filtered
  9. customevaporated in vacuo
  10. customThe residual oil (381.2 mg) was chromatographed on silica gel (11 g)
  11. washeluting with a mixture of ethyl acetate and hexane (1:10→1:5)

출처 및 근거

ORD 기록
ord-782f6cef43fc4f82aec00bdb695e9a69
출처 데이터셋
uspto-grants-1985_09
특허 번호
US04539152

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