Morpholino-based phosphorothioate analogs via oxathiaphospholane chemistry: synthesis, structural insights and stability

We present the application of the oxathiaphospholane method for the synthesis of novel P-stereodefined phosphorothioate N-modified morpholino analogs, showcasing its potential for creating therapeutically relevant compounds. Additionally, we provide valuable structural insights into their stereochemistry, including a detailed analysis of stereochemical configurations. We also report on the enzymatic stability of these compounds in 10% (v/v) fetal bovine serum (FBS), thereby mimicking in vivo conditions. These findings pave the way for further exploration of P-stereodefined nucleic acid analogs in molecular medicine and gene therapy applications.