Dynamic thermodynamic resolution of lithiated N-Boc-N′-alkylpiperazines
作者:Steven P. Robinson、Nadeem S. Sheikh、Carl A. Baxter、Iain Coldham
DOI:10.1016/j.tetlet.2010.05.019
日期:2010.7
Deprotonation of N-Boc-N'-alkylpiperazines with sec-BuLi in Et(2)O-TMEDA gave the 2-lithio derivatives which were resolved in the presence of a chiral ligand. The best ligands for the asymmetric substitution were diamino-alkoxides that promoted a dynamic thermodynamic resolution (DTR) of the organolithium at -30 degrees C. Electrophilic quench gave enantiomerically enriched 2-substituted piperazines. Of a selection of piperazines, the N'-t-butyl derivative gave the best results, with the product N-Boc-N'-t-butyl-2-substituted piperazines being formed with enantiomer ratios up to 81:19. (C) 2010 Elsevier Ltd. All rights reserved.
EP2727913A1
申请人:——
公开号:EP2727913A1
公开(公告)日:2014-05-07
[EN] (4-TERT-BUTYLPIPERAZIN-2-YL)(PIPERAZIN-1-YL)METHANONE-N-CARBOXAMIDE DERIVATIVES<br/>[FR] DÉRIVÉS DU (4-TERT-BUTYLPIPÉRAZIN-2-YL)(PIPÉRAZIN-1-YL)MÉTHANONE-N-CARBOXAMIDE
申请人:ASTRAZENECA AB
公开号:WO2010071567A1
公开(公告)日:2010-06-24
The present invention relates to compounds of formula (I) The compounds act via antagonism of the CCR2b receptor and may be used to treat inflammatory disease and/or neuropathic pain.