Scalable synthesis and structural characterization of reversible KLK6 inhibitors

Scalable asymmetric syntheses of two kallikrein-related protease 6 (KLK6) inhibitors are reported. The inhibitors are assembled by linking enantiomerically enriched fragments via amide bond formation, followed by conversion of a cyano group to an amidine. One fragment, an amine, was prepared using the Ellman auxiliary, and a lack of clarity in the literature regarding the stereochemical outcome of this reaction was solved via X-ray crystallographic analysis of two derivatives. Complexes of the inhibitors bound to human KLK6 were solved by X-ray crystallography, revealing the binding poses.

Automated summary

Scalable asymmetric syntheses of two kallikrein-related protease 6 (KLK6) inhibitors were achieved by linking enantiomerically enriched fragments via amide bond formation, followed by conversion of a cyano group to an amidine. X-ray crystallographic analysis of two derivatives clarified the stereochemical outcome of the reaction. X-ray crystallography of the inhibitor complexes bound to human KLK6 revealed their binding poses.