Dynamic thermodynamic resolution of lithiated N-Boc-N′-alkylpiperazines
摘要:
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.
COMPOSITIONS AND METHODS FOR INHIBITION OF THE JAK PATHWAY
申请人:Li Hui
公开号:US20100190770A1
公开(公告)日:2010-07-29
Disclosed are compounds of formula I, compositions containing them, and methods of use for the compounds and compositions in the treatment of conditions in which modulation of the JAK pathway or inhibition of JAK kinases, particularly JAK 2 and JAK3, are therapeutically useful.
Compositions and methods for inhibition of the JAK pathway
申请人:Rigel Pharmaceuticals, Inc.
公开号:US10005767B2
公开(公告)日:2018-06-26
Disclosed are compounds of formula I, compositions containing them, and methods of use for the compounds and compositions in the treatment of conditions in which modulation of the JAK pathway or inhibition of JAK kinases, particularly JAK 2 and JAK3, are therapeutically useful.
本文公开了式 I 的化合物、含有这些化合物的组合物,以及这些化合物和组合物用于治疗调节 JAK 通路或抑制 JAK 激酶(尤其是 JAK 2 和 JAK3)具有治疗作用的疾病的方法。