Preparation of a trans-calanolide ketone intermediate and chiral separation of calanolide alcohols to give racemic calanolide A

   
   

The method of the invention comprises a process for synthesizing a trans-calanolide A ketone intermediate used in the synthesis of racemic trans-calanolide A. The invention further comprises a method for removing a racemic calanolide B diastereomer from a mixture of calanolide A and calanolide B diastereomers formed in the last step of the synthesis of calanolide A by crystallization.

El método de la invención abarca un proceso para sintetizar un intermedio de la cetona de transporte-calanolide A usado en la síntesis de transporte-calanolide racémico A. La invención más futura abarca un método para quitar un diastereomer racémico del calanolide B de una mezcla de los diastereomers del calanolide A y del calanolide B formados en el paso pasado de la síntesis del calanolide A por la cristalización.

 
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