2-(4-(2-((1H-Benzo[d]imidazol-2-yl)thio)ethyl)piperazin-1-yl)-N-(6-methyl-2,4-bis(methylthio)pyridin-3-yl)acetamide hydrochloride (K-604, 2) has been identified as an aqueous-soluble potent inhibitor of human acyl-coenzyme A:cholesterol O-acyltransferase (ACAT, also known as SOAT)-1 that exhibits 229-fold selectivity for human ACAT-1 over human ACAT-2. In our molecular design, the insertion of a piperazine unit in place of a 6-methylene chain in the linker between the head (pyridylacetamide) and tail (benzimidazole) moieties led to a marked enhancement of the aqueous solubility (up to 19 mg/mL at pH 1.2) and a significant improvement of the oral absorption (the C_max of 2 was 1100-fold higher than that of 1 in fasted dogs) compared with those of the previously selected compound, 1. After ensuring the pharmacological effects and safety, we designated 2 as a clinical candidate, named K-604. Considering the therapeutic results of ACAT inhibitors in past clinical trials, we believe that K-604 will be useful for the treatment of incurable diseases involving ACAT-1 overexpression.

中文翻译：

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临床候选2-（4-（2-（（1 H-苯并[ d ]咪唑-2-基）硫代）乙基）哌嗪-1-基）-N-（6-甲基-2,4-bis （甲硫基）吡啶-3-基）乙酰胺盐酸盐[K-604]，水溶性酰基辅酶A：胆固醇O-酰基转移酶-1抑制剂

2-（4-（2-（（（1 H-苯并[ d ]咪唑-2-基]硫代]乙基]哌嗪-1-基] -N-（6-甲基-2,4-双（甲硫基）]吡啶-3-基）乙酰胺盐酸盐（K-604，2）已被确定为人类酰基辅酶A的水性可溶强效抑制剂：胆固醇ö -acyltransferase（ACAT，也称为这项方案）-1表现出229倍对人ACAT-1的选择性高于对人ACAT-2的选择性。在我们的分子设计中，在头部（吡啶基乙酰胺）和尾部（苯并咪唑）之间的连接基中插入哌嗪单元代替6-亚甲基链导致水溶解度显着提高（最高19 mg / mL） pH 1.2时）和口服吸收的显着改善（C _max为2为1100倍比的更高1与先前选择的化合物，相比于禁食的狗）1。在确保药理作用和安全性之后，我们指定2个临床候选药物，命名为K-604。考虑到ACAT抑制剂在过去的临床试验中的治疗结果，我们认为K-604将可用于治疗涉及ACAT-1过表达的不治之症。