Sequence-Defined Cationic Lipo-Oligomers Containing Unsaturated Fatty Acids for Transfection

Area of Science:

• Organic Chemistry
• Polymer Chemistry
• Biotechnology

Background:

• Cationic lipo-oligomers are effective nucleic acid carriers synthesized via solid-phase methods.
• Trifluoroacetic acid (TFA) cleavage can lead to undesired TFA adducts on unsaturated fatty acids.
• These adducts convert to hydroxylated derivatives, altering the desired chemical structure.

Purpose of the Study:

• To optimize the cleavage protocol for solid-phase supported synthesis of lipo-oligomers.
• To minimize the formation of trifluoroacetic acid (TFA) adducts during deprotection and cleavage.
• To preserve the integrity of unsaturated fatty acids in the final product.

Main Methods:

• Solid-phase supported synthesis of sequence-defined cationic lipo-oligomers.
• Optimization of the trifluoroacetic acid (TFA) cleavage step, including precooling the solution.
• Characterization of the synthesized lipo-oligomers to confirm structural integrity.

Main Results:

• An optimized cleavage protocol was developed involving precooling the TFA solution to 4°C.
• The optimized protocol significantly minimized the formation of TFA adducts on unsaturated fatty acids.
• High yields of lipo-oligomers with intact unsaturated hydrocarbon chains were achieved.

Conclusions:

• The developed cleavage protocol effectively prevents side reactions during TFA-mediated deprotection.
• This method ensures the structural fidelity of unsaturated fatty acids in synthesized lipo-oligomers.
• The optimized synthesis yields potent nucleic acid carriers with preserved functionality.