Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1996-07-03
1997-04-01
Dentz, Bernard
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C07D30792
Patent
active
056167377
ABSTRACT:
A process for the stereoselective preparation of (-)3a,6,6,9a-tetramethylperhydronaphtho[2,1-b]furan of the formula Ia ##STR1## by dehydration and cyclization of decahydro-2-hydroxy- 2,5,5,8-tetramethyl-1-naphthaleneethanol using solid acidic catalysts, wherein the decahydro-2-hydroxy- 2,5,5,8-tetramethyl-1-naphthaleneethanol is heated in the molten state at from 80.degree. to 200.degree. C. in the presence of from 10 to 100% by weight, based on the diol, of an active acidic aluminum oxide commercially supplied for (preparative) column chromatography.
REFERENCES:
patent: 3029255 (1962-04-01), Stoll
patent: 5274134 (1993-12-01), Bruns et al.
Chemical Abstracts, vol. 105, AN 134193k, 1986.
Helvetica Chimica Acta, vol. 68, pp. 2022-2029, 1985, G. Ohloff, et al., "Significance of the Geminal Dimethyl Group in the Odor Principle of Ambrox".
Dragoco Report, pp. 276-283, 1979, Ernst-Joachim Brunke, "Modifizierte Ambra-Rienchstoffe I. Stereospezifische Synthese Racemischer Analoga Von Ambrox".
Chemical Abstracts, vol. 105, 134193K (1986)-Abstract of Japan, Kokai 61-33184, (1984).
Grimmer Johannes
Martin Christoph
BASF - Aktiengesellschaft
Dentz Bernard
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