How is Thailanstatin A synthesized? ?

The biosynthesis of Thailanstatin A involves a hybrid polyketide synthase (PKS) and non-ribosomal peptide synthetase (NRPS) pathway, reflecting its microbial origin. While natural fermentation provides access to the compound, yields are generally low, prompting significant efforts in metabolic engineering and semi-synthetic optimization. From a synthetic chemistry perspective, Nicolaou and colleagues achieved the first total synthesis of Thailanstatin A and its methyl ester derivative, employing a convergent strategy based on cross-metathesis of modular subunits. The synthetic route successfully established eight of the nine stereogenic centers using tri-O-acetyl-D-glucal as a starting material. However, the instability of sensitive moieties, such as the epoxide and conjugated diene, poses major challenges for large-scale production and pharmaceutical formulation.