Reaktionsgleichung
C1(CBr)CC1.[CH:6]1([CH2:9][O:10][CH2:11][CH2:12][O:13][C:14]2[CH:19]=[CH:18][C:17]([OH:20])=[C:16]([CH3:21])[CH:15]=2)[CH2:8][CH2:7]1.[CH2:22]([CH:24]1[O:26][CH2:25]1)Cl.N1CCCCC1>O1CCCC1.[Pd]>[CH3:21][C:16]1[CH:15]=[C:14]([O:13][CH2:12][CH2:11][O:10][CH2:9][CH:6]2[CH2:8][CH2:7]2)[CH:19]=[CH:18][C:17]=1[O:20][CH2:22][CH:24]1[O:26][CH2:25]1Komponenten
Edukt 4
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 2
Versuchsvorschrift
The epoxide starting material is obtained from reaction of 4-hydroxy-3-methylphenyl benzoate with benzyl bromide to give 4-benzyloxy-3-methylphenyl benzoate (M.P. 120°-121° from methanol/ether), followed by de-esterification with 2M NaOH solution to give 4-benzyloxy-3-methylphenol (M.P. 69°-70° from ether/hexane) and reaction with 2-bromoethanol (light brown oil) to form an alcohol which is reacted with cyclopropylmethyl bromide in tetrahydrofuran. Debenzylation of the cyclopropylmethoxyethoxy derivative (unpurified) with 10% Pd on activated charcoal forms 4-(2-(cyclopropylmethoxy)ethoxy)-2-methylphenol which is then reacted with epichlorhydrin in the presence of a catalytic amount of piperidine to give 2-methyl-1-(2,3-epoxypropoxy)-4-(2-(cyclopropylmethoxy)ethoxy)benzene (light brown oil after chromatography on silica gel with toluene/ethyl-acetate (8:2)).
Quellen und Nachweise
- ORD-Eintrag
- ord-e0f6b927331840ff8925668d568d22be
- Quelldatensatz
- uspto-grants-1993_09
- Patentnummer
- US05242943
Verknüpfte Notizen
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