A Convergent Process for the Preparation of Adamantane 11-β-HSD-1 Inhibitors

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• 作者：Calvin L. Becker ; Kenneth M. Engstrom ; Francis A. Kerdesky ; John C. Tolle ; Seble H. Wagaw ; Weifeng Wang
• 刊名：Organic Process Research & Development
• 出版年：2008
• 出版时间：November 21, 2008
• 年：2008
• 卷：12
• 期：6
• 页码：1114-1118
• 全文大小：129K
• 年卷期：v.12,no.6(November 21, 2008)
• ISSN：1520-586X

文摘

A convergent, scalable process was developed for the synthesis of adamantane 11-β-hydroxysteroid dehydrogenase-1 inhibitors E-4-(2-methyl-2-(4-(5-(trifluoromethyl)pyridin-2-yl)piperazin-1-yl)propionylamino)adamantane-1-carboxylic acid (1) and E-4-(2-methyl-2-(4-(5-(trifluoromethyl)pyridin-2-yl)piperazin-1-yl)propionylamino)adamantane-1-carboxamide (2) to rapidly deliver material for development. The process was high yielding and provided 1 in 52% overall yield over six total steps with a five-step longest linear sequence and 2 in 45% overall yield over seven total steps with a six-step longest linear sequence. A process to prepare active pharmaceutical ingredient (API) of >99% purity at the kilogram scale has been developed under tight delivery timelines.