摘要:
The subject-matter of the invention is a process for the stereoselective preparation of a compound of general formula I by stereoselective displacement by a nitrogenous nucleophilic compound of the activated alcohol functional group present at this 4″ position in a corresponding derivative of formula II.
摘要:
The present invention relates to a process for preparing 9-deoxo-9(Z)-hydroxyiminoerythromycin A corresponding to formula (I) below: from 9-deoxo-9(E)-hydroxyiminoerythromycin A by reaction with a base in water or in a mixture of water/solvent of dialkyl ketone type capable of forming a crystallizable solvate with the desired 9(Z)-oxime; acidification of the reaction mixture to a pH of between 9 and 11; addition to the said mixture of an organic solvent; optionally concentration under vacuum of the resulting organic phase; and isolation of the desired 9(Z)-erythromycin oxime.
摘要:
Provided is a new photochemical process for preparing artemisinin. Also provided are certain dihydroartemisinic acid derivatives useful for preparing artemisinin.
摘要:
The subject-matter of the invention is a process for the stereoselective preparation of a compound of general formula I by stereoselective displacement by a nitrogenous nucleophilic compound of the activated alcohol functional group present at this 4″ position in a corresponding derivative of formula II.
摘要:
Provided is a new photochemical process for preparing artemisinin. Also provided are certain dihydroartemisinic acid derivatives useful for preparing artemisinin.