Method for producing (+)-estrone derivatives
AssigneeChisso Corporation
InventorsSeiichi Takano, Kunio Ogasawara
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Abstract
The present invention provides a method for producing (+)-estrone derivatives, characterized in that it comprises starting from a certain cyclopentadiene derivative, reacting the derivative with a certain diene compound by an asymmetric Diels-Alder reaction, and via intermediates obtaining a (+)-estron derivative represented by the following formula: ##STR1## wherein R is alkyl of 1-20 carbon atoms. According to the present invention, (+)-estron derivatives can be obtained by limited steps from the starting materials of dicyclopentadiene derivatives.
Claims4
A compound represented by the formula:
- ##STR8## wherein R is alkyl of 1-20 carbon atoms.
A compound represented by the formula:
- ##STR9## wherein R is alkyl of 1-20 carbon atoms.
A compound represented by the formula:
- ##STR10## wherein R is alkyl of 1-20 carbon atoms.
A compound represented by the formula:
- ##STR11## wherein R is alkyl of 1-20 carbon atoms.
Dependencies are inferred from the claim text.