Diastereoselective In and Zn-mediated allylation of pyrazol-4-yl derived (R)-tert-butanesulfinyl imines: synthesis of enantiomerically pure 6-(pyrazol-4-yl)-piperidin-2,4-diones
摘要:
The In and Zn-mediated allylation of substituted pyrazol-4-yl derived (R)-N-tert-butanesulfinyl imines proceeds with high diastereoselectivity depending on the conditions and additives (up to 99.4% de). Thus, the synthesized diastereomeric homoallylsulfinamides were isolated and characterized as pure diastereomers, which were then converted into the corresponding pyrazol-4-yl-derived N-Boc-homoallylamines via consecutive treatment with HCl and Boc(2)O. The latter were then subjected to a sequence of reactions: cyclobromocarbamation with NBS and enolateisocyanate rearrangement with tBuOK to give novel enantiomerically pure (S)-6-(pyrazol-4-yl)-piperidine-2,4-diones in 88-96% yield. The absolute configurations of the allylation products were assigned by X-ray single crystal analysis of the intermediate bromomethylurethanes. (C) 2014 Elsevier Ltd. All rights reserved.
Diastereoselective In and Zn-mediated allylation of pyrazol-4-yl derived (R)-tert-butanesulfinyl imines: synthesis of enantiomerically pure 6-(pyrazol-4-yl)-piperidin-2,4-diones
摘要:
The In and Zn-mediated allylation of substituted pyrazol-4-yl derived (R)-N-tert-butanesulfinyl imines proceeds with high diastereoselectivity depending on the conditions and additives (up to 99.4% de). Thus, the synthesized diastereomeric homoallylsulfinamides were isolated and characterized as pure diastereomers, which were then converted into the corresponding pyrazol-4-yl-derived N-Boc-homoallylamines via consecutive treatment with HCl and Boc(2)O. The latter were then subjected to a sequence of reactions: cyclobromocarbamation with NBS and enolateisocyanate rearrangement with tBuOK to give novel enantiomerically pure (S)-6-(pyrazol-4-yl)-piperidine-2,4-diones in 88-96% yield. The absolute configurations of the allylation products were assigned by X-ray single crystal analysis of the intermediate bromomethylurethanes. (C) 2014 Elsevier Ltd. All rights reserved.
Compounds having the formula I wherein R
2
, X and Z as defined herein are inhibitors of ERK kinase. Also disclosed are compositions and methods for treating hyperproliferative disorders.
SERINE/THREONINE KINASE INHIBITORS FOR THE TREATMENT OF HYPERPROLIFERATIVE DISEASES
申请人:Array Biopharma, Inc.
公开号:EP2888247B1
公开(公告)日:2020-03-25
US9388171B2
申请人:——
公开号:US9388171B2
公开(公告)日:2016-07-12
Diastereoselective In and Zn-mediated allylation of pyrazol-4-yl derived (R)-tert-butanesulfinyl imines: synthesis of enantiomerically pure 6-(pyrazol-4-yl)-piperidin-2,4-diones
作者:Nikolai Yu. Kuznetsov、Victor N. Khrustalev、Tatyana V. Strelkova、Yuri N. Bubnov
DOI:10.1016/j.tetasy.2014.03.003
日期:2014.4
The In and Zn-mediated allylation of substituted pyrazol-4-yl derived (R)-N-tert-butanesulfinyl imines proceeds with high diastereoselectivity depending on the conditions and additives (up to 99.4% de). Thus, the synthesized diastereomeric homoallylsulfinamides were isolated and characterized as pure diastereomers, which were then converted into the corresponding pyrazol-4-yl-derived N-Boc-homoallylamines via consecutive treatment with HCl and Boc(2)O. The latter were then subjected to a sequence of reactions: cyclobromocarbamation with NBS and enolateisocyanate rearrangement with tBuOK to give novel enantiomerically pure (S)-6-(pyrazol-4-yl)-piperidine-2,4-diones in 88-96% yield. The absolute configurations of the allylation products were assigned by X-ray single crystal analysis of the intermediate bromomethylurethanes. (C) 2014 Elsevier Ltd. All rights reserved.