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Generated: July 21, 2017

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Details for Patent: 7,842,687

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Summary for Patent: 7,842,687

Title:Cephalotaxane derivatives and their processes of preparation and purification
Abstract: The present invention concerns a new general process for asymmetric hemisynthesis of harringtonines and their analogs, that are alkaloids used in chemotherapy. This process comprises direct esterification of a natural cephalotaxine with an acylating compound constituted of a side chain precursor which backbone and functionalization are entirely preformed. The invention also concerns a natural, synthetic or semi-synthetic harringtonines including their tautomeric forms and their salts of the following formula: ##STR00001## wherein n=2 (i.e. harringtonine) or n=3 (i.e. homoharringtonine), in which the total content of impurities, possibly including enantiomeric forms, is lower than 1%, and/or the content of the major impurity is lower than 0.9%, and/or the chromatographic assay exhibits a harringtonines content higher than 97.5%.
Inventor(s): Robin; Jean-Pierre (Nyon, CH), Blanchard; Julie (Rouillon, FR), Marie; Jean-Pierre (Sevres, FR), Radosevic; Nina (Nyon, CH)
Assignee: Chemgenex Pharmaceuticals, Inc. (Geelong, Victoria, AU)
Application Number:11/440,648
Patent Claim Types:
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Compound; Composition; Use;

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Foreign Priority and PCT Information for Patent: 7,842,687

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
France98 03492Mar 20, 1998

International Patent Family for Patent: 7,842,687

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Turkey200003613► Subscribe
Portugal1064285► Subscribe
Poland343032► Subscribe
Japan2004523586► Subscribe
Japan6087381► Subscribe
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.

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