Process for resolving certain spiro compounds

Details Process for resolving certain spiro compounds Process for resolving certain spiro compounds

1985-10-22

1986-09-09

Schwartz, Richard A.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548410, C07D48710

Patent

active

046110623

ABSTRACT:
The invention concerns a novel process for the racemization of unwanted enantiomeric forms of 1'-substituted spiro[imidazolidine-4,3'-indoline]-2,2',5-triones and 1'-substituted spiro[pyrrolidine-3,3'-indoline]-2,2',5-triones which comprises heating an unwanted enantiomeric form (or a mixture containing an excess of one enantiomer over the other) alone or, more conveniently, in the presence of a solvent or diluent at a temperature in the range 80.degree. to 280.degree. C.

REFERENCES:
patent: 2743284 (1956-04-01), Klein et al.
patent: 3024231 (1962-03-01), Scherrer
Gilman, H. et al., (Editors) Organic Chemistry, John Wiley, New York, 1938, pp. 176-177.

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