Two scalable and efficient synthetic routes for the synthesis of a T-type calcium channel antagonist MK-8998 were developed from a simple pyridine building block. The key step to set the stereochemistry relied on either chiral rhodium catalyst-mediated asymmetric hydrogenation of an enamide or transamination of an arylketone that provided the corresponding product in high enantioselectivity and high yield.

中文翻译：

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T 型钙通道拮抗剂 MK-8998 的可扩展不对称合成

从简单的吡啶构建块开发了两种用于合成 T 型钙通道拮抗剂 MK-8998 的可扩展且有效的合成路线。设置立体化学的关键步骤依赖于手性铑催化剂介导的烯酰胺不对称氢化或芳基酮的氨基转移，从而以高对映选择性和高产率提供相应的产物。