The present invention provides BACE inhibitors of Formula I:
methods for their use, intermediates, and methods for their preparation.
本发明提供了式I的BACE抑制剂:它们的使用方法、中间体以及它们的制备方法。
Synthesis of BACE Inhibitor LY2886721. Part II. Isoxazolidines as Precursors to Chiral Aminothiazines, Selective Peptide Coupling, and a Controlled Reactive Crystallization
作者:Marvin M. Hansen、Daniel J. Jarmer、Enver Arslantas、Amy C. DeBaillie、Andrea L. Frederick、Molly Harding、David W. Hoard、Adrienne Hollister、Dominique Huber、Stanley P. Kolis、Jennifer E. Kuehne-Willmore、Thomas Kull、Michael E. Laurila、Ryan J. Linder、Thomas J. Martin、Joseph R. Martinelli、Michael J. McCulley、Rachel N. Richey、Derek R. Starkey、Jeffrey A. Ward、Nikolay Zaborenko、Theo Zweifel
DOI:10.1021/op500327t
日期:2015.9.18
An efficient synthesis of LY2886721 (1) in five steps and 46% overall yield from the chiral nitrone cycloadduct 2 is presented. Minimizing formation of a des-fluoro impurity during hydrogenolysis to cleave the isoxazolidine ring and remove the benzyl chiral auxiliary was a key challenge. Installation of the aminothiazine moiety required careful stoichiometry control of the reagents BzNCS and CDI, including in situ conversion monitoring, to minimize byproduct formation. A remarkably regioselective peptide coupling afforded 1 without competing acylation at the aminothiazine nitrogen or bis-acylation. Consideration of the combined chemistry and crystallization process identified an optimal solvent system for the peptide coupling and a reactive crystallization that afforded 1 in high purity and with physical property control. A slurry milling operation near the end of the crystallization, followed by "pH cycles" to digest fines formed during milling, significantly reduced the crystal aspect ratio and provided desirable API bulk density and powder flow properties.
US8278441B2
申请人:——
公开号:US8278441B2
公开(公告)日:2012-10-02
[EN] BACE INHIBITORS<br/>[FR] INHIBITEURS DE BACE
申请人:LILLY CO ELI
公开号:WO2011005738A1
公开(公告)日:2011-01-13
The present invention provides BACE inhibitors of Formula I: methods for their use, intermediates, and methods for their preparation.
BACE INHIBITORS
申请人:AUDIA James Edmund
公开号:US20110009395A1
公开(公告)日:2011-01-13
The present invention provides BACE inhibitors of Formula I:
methods for their use, intermediates, and methods for their preparation.