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.

5-HT ₇拮抗剂1-苄基-3-（4-氯苯基）-1,4,5,6,7,8-六氢吡唑并[3,4- d ]氮杂的合成是使用a的区域选择性组装来描述的与吡咯环稠合的吡唑环。检查了两种不同的方法用于稠合吡唑-氮杂杂环核心的构建。这些基于附接的芳基环的安装时间和方法以及稠合杂环的构造。该团队着重研究了一种以钯偶联反应为特征的途径，该反应通过三氟甲磺酸吡唑引入芳环，并进行选择性烷基化以设定苄基在吡唑氮上的位置。这导致1的可扩展综合 （JNJ-18038683）允许发现小组选择并提升临床候选人。