On June 28, 2018, Crew, Andrew P.; Hornberger, Keith R.; Wang, Jing; Dong, Hanqing; Qian, Yimin; Crews, Craig M.; Jaime-Figueroa, Saul published a patent.Reference of tert-Butyl 3-(piperidin-4-yl)azetidine-1-carboxylate The title of the patent was Preparation of heterocyclic compounds and methods for the targeted degradation of rapidly accelerated fibrosarcoma polypeptides. And the patent contained the following:
The disclosure relates to bifunctional compounds of formula I, which find utility as modulators of rapidly accelerated fibrosarcoma (RAF, the target protein). The disclosure exhibits a broad range of pharmacol. activities associated with degradation/inhibition of target protein. Diseases or disorders that result from aggregation or accumulation of the target protein, or the constitutive activation of the target protein, are treated or prevented with compounds and compositions of the disclosure. Bifunctional compounds of formula I wherein ULM is a small mol. E3 ubiquitin ligand binding moiety that binds to E3 ubiquitin ligase selected from a group consisting of Von Hippel-Lindau, cereblon, inhibitors of apoptosis proteins or mouse double-minute homolog 2 ligand; PTM is a small mol. that binds the target protein RAF; L is a bond and a chem. linking moiety; and their pharmaceutically acceptable salts, enantiomers, stereoisomers, solvates, polymorphs and prodrugs thereof, are claimed. Example compound II was prepared by a multistep procedure (procedure given). The invention compounds were evaluated for their B-RAF degradation activity. From the assay, it was determined that compound II exhibited DC50 value in the range of < 100 nM to > 50 nM and Dmax value of > 70 %. The experimental process involved the reaction of tert-Butyl 3-(piperidin-4-yl)azetidine-1-carboxylate(cas: 1251006-64-0).Reference of tert-Butyl 3-(piperidin-4-yl)azetidine-1-carboxylate
The Article related to heterocycle preparation braf protein target degradation, Heterocyclic Compounds (More Than One Hetero Atom): Pyrazoles and other aspects.Reference of tert-Butyl 3-(piperidin-4-yl)azetidine-1-carboxylate
Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem