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US 3,946,041 AGranted
6-(3,4-Methylenedioxy-6-benzylalkylaminoethylphenylacetyl)benzoic acid alkyl ester derivatives
AssigneeHoffmann-La Roche Inc.
InventorsArnold Brossi, Wilhelm Kloetzer, Sidney Teitel
Life of this patent
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Abstract
The present invention relates to the preparation of novel rheadan-type alkaloids and to novel intermediates useful in the preparation thereof. The process utilizes as starting materials a known class of alkaloids of the narcotine or of the hydrastine type. Certain of the said novel intermediates are also pharmaceutically useful in and of themselves. Additionally, certain of the novel intermediates can be converted into other type alkaloids which are also pharmaceutically useful.
Claims3
A compound of the formula ##SPC7##
- wherein R.sub.1 and R.sub.2 taken together are methylenedioxy;
- R.sub.3 represents hydrogen or lower alkoxy;
- R.sub.4 represents lower alkyl and R.sub.6 and R.sub.7 represent individually lower alkyl or when taken together are methylene.
Dependencies are inferred from the claim text.