Asymmetric Synthesis of a Pyrrolizidinone‐Based hNK
<sub>1</sub>
Antagonist through Reductive Ring Contraction of a Six‐Membered Cyclic Nitronate
作者:Ilya V. Okladnikov、Yaroslav D. Boyko、Yulia V. Nelyubina、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1002/ejoc.202200796
日期:2022.11.7
A seven-step asymmetricsynthesis of a potent hNK1 antagonist has been accomplished through a stereoselectivereductive recyclization of a properly functionalized six-membered cyclic nitronate.
Stereoselective Preparation of a Cyclopentane-Based NK1 Receptor Antagonist Bearing an Unsymmetrically Substituted Sec−Sec Ether
作者:Jeffrey T. Kuethe、Jean-Francois Marcoux、Audrey Wong、Jimmy Wu、Michael C. Hillier、Peter G. Dormer、Ian W. Davies、David L. Hughes
DOI:10.1021/jo061268x
日期:2006.9.1
A highly efficient synthesis of the potent and selective NK-1 receptor antagonist 1 is described. The key transformation involved the etherification reaction between cyclopentanol 12 and chiral imidate 30 which was catalyzed by HBF4 to initially give ether 14 as a 17:1 mixture of diastereomers and in 75% combined yield. The diastereoselectivity was upgraded to 109:1 by crystallization of the triethylamine solvate 44 which was isolated in 54% yield from 12. Mechanistic studies confirmed that the etherification reaction proceeds through an unprecedented S(N)2 reaction pathway under typical S(N)1 reaction conditions.
NK1 antagonists based on seven membered lactam scaffolds
作者:Jason M. Elliott、Emma J. Carlson、Gary G. Chicchi、Olivier Dirat、Maria Dominguez、Ute Gerhard、Richard Jelley、A. Brian Jones、Marc M. Kurtz、Kwei lan Tsao、Alan Wheeldon
DOI:10.1016/j.bmcl.2006.02.080
日期:2006.6
A new class of high affinity hNK(1)R antagonists based on seven-membered ring cores has been identified. This series, with relatively simple, compact structures, includes compounds with high affinity, good selectivity, and promising in vivo properties. (c) 2006 Elsevier Ltd. All rights reserved.