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Published on: February 7, 2019
Asymmetric Synthesis of Chiral δ-Caprolactams: Access to a Key Intermediate of Ubrogepant
Qingyuan Shi1, Yuhuan Zhang1, Xuan Chen1
1Medical Basic Research Innovation Center for Cardiovascular and Cerebrovascular Diseases, Ministry of Education, International Joint Laboratory for Drug Target of Critical Illnesses, School of Pharmacy, Nanjing Medical University, Nanjing211166, China.
Abstract:
Chiral δ-caprolactam constitutes the key pharmacophore of Calcitonin gene-related peptide receptor antagonists such as ubrogepant and atogepant, and its synthesis is quite challenging. Herein, we report a novel, robust, and potentially scalable asymmetric synthesis strategy for chiral δ-caprolactam. The δ-caprolactam scaffold is first constructed via a one-pot process, followed by sequential installation of three stereocenters through crystallization-induced dynamic kinetic resolution and catalytic hydrogenation. This protocol offers distinct advantages, including the absence of enzymatic catalysis and column chromatography.
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