Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1976-09-14
1978-08-22
Morgenstern, Norman
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
2603403, 2603405AS, 260397, 2603973, 2603974, 260590E, C07C 4500
Patent
active
041088980
ABSTRACT:
Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
REFERENCES:
patent: 2542223 (1951-02-01), Wendler et al.
patent: 3682970 (1972-08-01), Hendricks et al.
Fedorova et al., "Zh. Obsch. Khim.", vol. 40, No. 3, pp. 690-693 (1968).
Ebel, "Stereochemistry of Carbon Compounds," pp. 65-83 (1962).
Hajos Zoltan George
Parrish David Richard
Gould George M.
Hoffmann-La Roche Inc.
Morgenstern Norman
Welt Samuel L.
Wittekind Raymond R.
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