Regioselective assembly of fused pyrazole-azepine heterocycles: Synthesis of the 5-HT7 antagonist 1-benzy1-3-(4-chlorophenyl)-1,4,5,6,7,8-hexahydropyrazolo[3,4-d]azepine

The synthesis of the 5-HT7 antagonist 1-benzyl-3-(4-chlorophenyl)-1,4,5,6,7,8-hexahydropyrazolo[3,4-d] azepine is described using a regioselective assembly of a pyrazole ring fused to an azepine ring. Two different approaches were examined for the construction of the fused pyrazole-azepine heterocyclic core. These were based on the timing and method of installation of the appended aryl ring and construction of the fused heterocycle. The team focused on a route that featured a palladium coupling reaction to introduce the aryl ring via a pyrazole triflate and a selective alkylation to set the position of benzyl moiety on the pyrazole nitrogen. This led to a scalable synthesis of 1 (JNJ-18038683) allowing the discovery team to select and advance a clinical candidate. (C) 2021 Elsevier Ltd. All rights reserved.