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One-pot synthesis of human metabolites of SAR548304 by fungal peroxygenases
Kiebist J, Holla W, Heidrich J, Poraj-Kobielska M, Sandvoss M, Simonis R, Gröbe G, Atzrodt J, Hofrichter M, Scheibner K

Bioorgan. Med. Chem., 23: 4324-4332

Unspecific peroxygenases (UPOs, EC have proved to be stable oxygen-transferring biocatalysts for H2O2-dependent transformation of pharmaceuticals. We have applied UPOs in a drug development program and consider the enzymatic approach in parallel to a conventional chemical synthesis of the human metabolites of the bile acid reabsorption inhibitor SAR548304. Chemical preparation of N,N-di-desmethyl metabolite was realized by a seven-step synthesis starting from a late precursor of SAR548304 and included among others palladium catalysis and laborious chromatographic purification with an overall yield of 27%. The enzymatic approach revealed that the UPO of Marasmius rotula is particularly suitable for selective N-dealkylation of the drug and enabled us to prepare both human metabolites via one-pot conversion with an overall yield of 66% N,N-di-desmethyl metabolite and 49% of N-mono-desmethylated compound in two separated kinetic-controlled reactions

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