Acetate → N-(t-butyldimethylsilyl)-4-[3-(p-nitrobenzyloxycarbonyl)-2-oxopropyl]-azetidin-2-one

HRID 371290노트

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HRID 371290 반응식
N1C=CC=CC=1.[Si:7]([N:14]1[CH:17]([CH2:18][CH:19]([OH:34])[CH2:20][C:21]([O:23][CH2:24][C:25]2[CH:30]=[CH:29][C:28]([N+:31]([O-:33])=[O:32])=[CH:27][CH:26]=2)=[O:22])[CH2:16][C:15]1=[O:35])([C:10]([CH3:13])([CH3:12])[CH3:11])([CH3:9])[CH3:8].CC(O)C.C([O-])(=O)C>C(Cl)Cl.[O-2].[O-2].[O-2].[Cr+6]>[Si:7]([N:14]1[CH:17]([CH2:18][C:19](=[O:34])[CH2:20][C:21]([O:23][CH2:24][C:25]2[CH:26]=[CH:27][C:28]([N+:31]([O-:33])=[O:32])=[CH:29][CH:30]=2)=[O:22])[CH2:16][C:15]1=[O:35])([C:10]([CH3:13])([CH3:12])[CH3:11])([CH3:9])[CH3:8]

참가 물질

7

반응물 4

HCID 175AcetateHCID 1049PyridineHCID 3776IsopropanolHCID 12848994N-(t-butyldimethylsilyl)-4-[3-(p-nitrobenzyloxycarbonyl)-2-hydroxypropyl]-azetidin-2-one

생성물 1

HCID 12804721N-(t-butyldimethylsilyl)-4-[3-(p-nitrobenzyloxycarbonyl)-2-oxopropyl]-azetidin-2-one수율 58.3%

시약·촉매·용매 2

HCID 10219390chromium (VI) trioxide촉매HCID 6344Dichloromethane용매2회

실험 절차

Anhydrous chromium trioxide (16.88 g 169 mmol) is added to a solution of anhydrous pyridine (27.3 ml, 338 mmol) in anhydrous methylene chloride (470 ml). The resulting mixture is stirred at room temperature for 30 minutes and then treated with a solution of N-(t-butyldimethylsilyl)-4-[3-(p-nitrobenzyloxycarbonyl)-2-hydroxypropyl]-azetidin-2-one (8.92 g, 21.1 mmol) in methylene chloride (80 ml). The reaction mixture is stirred an additional 15 minutes at room temperature and then treated with 2-propanol (6.75 ml). The methylene chloride paste is decanted from the dark, tary residue and evaporated under vacuum. The residue from this operation is triturated with diethyl ether (350 ml) and filtered through a pad of magnesium sulfate which is washed with additional ether (150 ml). The ethereal filtrate is washed with water (200 ml), 5% aqueous sodium bicarbonate (200 ml) and brine, dried with magnesium sulfate, filtered, evaporated under vacuum, and stripped with toluene to afford the crude product (5.98) as an amber oil. Chromatigraphy on a silica gel column using 3:2 petroleum etherethyl acetate as eluting solvent yields N-(t-butyldimethylsilyl)-4-[3-(p-nitrobenzyloxycarbonyl)-2-oxopropyl]-azetidin-2-one (5.17 g, 58%) as a pale yellow, viscous oil which solidifies. Trituration with diethyl ether gives the product as small, white crystals: mp 65°-66.5°, IR (CH2CL2) 1732, 1522, and 1350 cm) NMR (CDCl3) 8 0.20 (s,3,CH3), 0.23 (s,3,CH3), 0.93 (s,9,C(CH3)3), 2.58 (dd,1,J=2.7 and 15.7, H3β), 2.72 (dd,1, J=9.4 and 18.2, CH2COCH2CO2), 3.19 (dd,1,J=4.0 and 18.2, CH2COCH2CO2), 3.35 (dd,1,J=5.3 and 15.7,H3α), 3.55 (s,2, COCH2CO2), 3.90 (m,1,H4), 5.30 (s,2,CH2Ar), 7.55 and 8.25 (two d15,4,J-8.5, ArH); MS m/e 405 (M+ -15), 363 (M+ -57), 321 (363-42) and 136.

후처리

  1. stirringThe reaction mixture is stirred an additional 15 minutes at room temperature
  2. customThe methylene chloride paste is decanted from the dark, tary residue
  3. customevaporated under vacuum
  4. customThe residue from this operation is triturated with diethyl ether (350 ml)
  5. filtrationfiltered through a pad of magnesium sulfate which
  6. washis washed with additional ether (150 ml)
  7. washThe ethereal filtrate is washed with water (200 ml), 5% aqueous sodium bicarbonate (200 ml) and brine
  8. dry with materialdried with magnesium sulfate
  9. filtrationfiltered
  10. customevaporated under vacuum
  11. customto afford the crude product (5.98) as an amber oil
  12. washas eluting solvent

출처 및 근거

ORD 기록
ord-2654bfffe6a44471bbdd9d060b644434
출처 데이터셋
uspto-grants-1985_07
특허 번호
US04530841

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