Total synthesis of azithromycin.

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Asymmetric Synthesis

Background:

• Azithromycin is a widely used macrolide antibiotic known for its improved pharmacological profile over older erythromycins.
• The synthesis of complex molecules with multiple stereocenters, particularly quaternary carbons, presents significant synthetic challenges.

Purpose of the Study:

• To develop an enantioselective synthetic route towards Azithromycin.
• To establish a method for the efficient construction of stereogenic quaternary carbon centers relevant to Azithromycin synthesis.

Main Methods:

• Utilized a desymmetrization strategy starting from 2-substituted glycerols.
• Employed a chiral imine/Copper(II) chloride (CuCl2) catalyst system to control stereochemistry.

Main Results:

• Successfully elaborated all stereogenic quaternary carbon centers in the target molecule.
• Demonstrated the efficacy of the chiral imine/CuCl2 catalyst in achieving enantioselectivity.

Conclusions:

• The developed method provides an effective approach for the enantioselective synthesis of Azithromycin.
• This strategy highlights the potential of catalytic desymmetrization for constructing complex chiral molecules.