4-Nitrobenzyl bromide → N-(t-butyldimethylsilyl)-4-[3-(p-nitrobenzyloxycarbonyl)-2-hydroxypropyl]-azetidin-2-one

HRID 371289Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 371289
[Si:1]([N:8]1[CH:11]([CH2:12][CH:13]([OH:18])[CH2:14][C:15]([OH:17])=[O:16])[CH2:10][C:9]1=[O:19])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[N+:20]([C:23]1[CH:30]=[CH:29][C:26]([CH2:27]Br)=[CH:25][CH:24]=1)([O-:22])=[O:21]>C(N(CC)CC)C>[Si:1]([N:8]1[CH:11]([CH2:12][CH:13]([OH:18])[CH2:14][C:15]([O:17][CH2:27][C:26]2[CH:29]=[CH:30][C:23]([N+:20]([O-:22])=[O:21])=[CH:24][CH:25]=2)=[O:16])[CH2:10][C:9]1=[O:19])([C:4]([CH3:6])([CH3:7])[CH3:5])([CH3:3])[CH3:2]

Komponenten

4

Edukt 2

HCID 660114-Nitrobenzyl bromideHCID 15136308N-(t-butyldimethylsilyl)-4-(3-carboxy-2-hydroxypropyl)-azetidin-2-one

Produkt 1

HCID 12848994N-(t-butyldimethylsilyl)-4-[3-(p-nitrobenzyloxycarbonyl)-2-hydroxypropyl]-azetidin-2-one

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8471TriethylamineLösungsmittel

Versuchsvorschrift

The crude carboxylic acid is suspended in anhydrous acetonitrate (150 ml) and treated with p-nitrobenzyl bromide (7.56 g, 35 mμol) and triethylamine (4.9 ml, 35 mμol). The resulting solution is kept at room temperature for 2 days and then in a refrigerator for 3 days. The reddish orange solution is evaporated under vacuum and the residue shaken with ethyl acetate (100 ml, 2×50 ml) and filtered to remove triethylammonium bromide. The ethyl acetate filtrate is washed with water (3×100 ml) and brine, dried with magnesium sulfate, filtered, and evaporated under vacuum to an amber oil (13.62 g). Crystallization from diethyl ether affords N-(t-butyldimethylsilyl)-4-[3-(p-nitrobenzyloxycarbonyl)-2-hydroxypropyl]-azetidin-2-one (6.84 g) as an off-white powder. Chromatography of the mother liquors on a silica gel column using 1:1 toluene-ethyl acetate as eluting solvent affords addition product (3.14 g) as an oil which solidifies.

Aufarbeitung

  1. waitin a refrigerator for 3 days
  2. customThe reddish orange solution is evaporated under vacuum
  3. filtrationfiltered
  4. customto remove triethylammonium bromide
  5. washThe ethyl acetate filtrate is washed with water (3×100 ml) and brine
  6. dry with materialdried with magnesium sulfate
  7. filtrationfiltered
  8. customevaporated under vacuum to an amber oil (13.62 g)
  9. customCrystallization from diethyl ether

Quellen und Nachweise

ORD-Eintrag
ord-20643c4863ce4d0fbd20d71c5bb12be2
Quelldatensatz
uspto-grants-1985_07
Patentnummer
US04530841

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