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Rapid Two-Step Multicomponent Synthesis and Structure-degradation Relationships of Selective HDAC6 PROTAC Degraders.

Aug 2026 · Journal of Medicinal Chemistry · Vol 69 17, pp. 21018-21043 · 0 citations · 52 references
Medicine

TL;DR

This study establishes an efficient multicomponent strategy for PROTAC synthesis and highlights key structure-degradation relationships in HDAC6 degraders.

Abstract

This work reports on the development of selective histone deacetylase 6 (HDAC6) degraders based on a peptoid scaffold. Structure-based design identified the isocyanide-derived cap region as suitable exit vector for linker attachment, enabling rapid generation of CRBN-recruiting PROTACs via the Ugi four-component reaction. A focused library of 12 degraders revealed a strong dependence of activity on linker composition, with octyl-linked compounds (9e-h) showing the strongest HDAC6 degradation with half-maximal degradation values of 17-36 nM in kinetic HDAC6 degradation assays. The lead compounds selectively degraded HDAC6 in MM.1S and MV4-11 cells without affecting class I HDACs and demonstrated clean proteomic profiles. Functionally, compounds 9e and 9f displayed submicromolar antiproliferative activity against FLT3-ITD-mutated acute myeloid leukemia cells and suppressed proinflammatory signaling in immune cells. Both effects were associated in part with residual class I HDAC inhibition. Overall, this study establishes an efficient multicomponent strategy for PROTAC synthesis and highlights key structure-degradation relationships.

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