Reaktionsgleichung
C(OCC)C.[C:6]([C:14]([O:16][CH2:17][CH3:18])=[O:15])(=[O:13])[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1>O1CCCC1>[C:14]([O:16][CH2:17][CH3:18])(=[O:15])[CH:6]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)[OH:13]Komponenten
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
According to JP-A-11-193271, ethyl benzoylformate and cyclohexylmagnesium bromide are condensed to give ethyl 2-cyclohexyl-2-hydroxy-2-phenylacetate, which is hydrolyzed to give 2-cyclohexyl-2-hydroxy-2-phenylacetic acid. In this condensation reaction, diethyl ether having a boiling point of 35° C. is used in an amount of about 12-fold volume relative to ethyl benzoylformate, manipulation of dangerous reaction using the boiling point of diethyl ether is required and the yield is as low as 53.3%. In an attempt to improve this method into an industrially safe one, the present inventors used tetrahydrofuran instead of diethyl ether as a solvent and reproduced the reaction. As a result, there occurred reduction due to Grignard reagent to produce ethyl mandelate as a by-product, as well as addition of the Grignard reagent to ester bond. The proportion of the starting material that became a by-product was 42% and the yield of the objective product was as low as 58%. After hydrolysis of the obtained crude ethyl 2-cyclohexyl-2-hydroxy-2-phenylacetate, it was subjected to recrystallization and the like to increase the purity but the yield from ethyl benzoylformate of 2-cyclohexyl-2-hydroxy-2-phenylacetic acid did not exceed 43%.
Aufarbeitung
- customthe reaction
Quellen und Nachweise
- ORD-Eintrag
- ord-ed2a78de811c45498b5fa08a26c3012f
- Quelldatensatz
- uspto-grants-2004_08
- Patentnummer
- US06777576B2
Verknüpfte Notizen
Wird geladen…