Practical Preparation of a 1,3,5-Trisubstituted Pyridazin-4(1<i>H</i>)-one Using Selective C<sub>1</sub> Unit Insertion and Cyclization
作者:Akihiro Suzuki、Naohiro Fukuda、Takeshi Kajiwara、Tomomi Ikemoto
DOI:10.1021/acs.oprd.8b00394
日期:2019.4.19
A novel and practical preparation of the selective phosphodiesterase 10A (PDE10A) inhibitor 1 having the core moiety of a 1,3,5-trisubstituted pyridazin-4(1H)-one has been achieved. The facile preparation of 1 in 42% overall yield involves the following key features: (1) the finding that filling the headspace of the reaction vessel with Ar gas and controlling the flow rate of the gas were found to
已经实现了新颖且实用的具有1,3,5-三取代哒嗪-4(1 H)-one核心部分的选择性磷酸二酯酶10A(PDE10A)抑制剂1的制备。的容易制备1在42%的总收率涉及以下关键特征:(1)在填充有氩气的反应容器的顶部空间和控制气体的流率被发现是重要的,完成的取代的发现芳基碘化物与吡唑;(2)合成3-乙酰基-5-甲氧基取代的哒嗪-4(1 H)-通过重氮化合物的区域选择性二甲基氨基亚甲基化和同时环化得到的一个;(3)通过二甲基氨基亚甲基与苯肼的反应,形成1,5-二取代的吡唑的区域选择性环。另外,已经发现通过1-苯基吡唑的选择性烷基化来合成1的替代方法。