Bis(difluoromethyl)trimethylsilicate Anion: A Key Intermediate in Nucleophilic Difluoromethylation of Enolizable Ketones with Me<sub>3</sub>SiCF<sub>2</sub>H
作者:Dingben Chen、Chuanfa Ni、Yanchuan Zhao、Xian Cai、Xinjin Li、Pan Xiao、Jinbo Hu
DOI:10.1002/anie.201605280
日期:2016.10.4
A pentacoordinate bis(difluoromethyl)silicate anion, [Me3Si(CF2H)2]−, is observed for the first time by the activation of Me3SiCF2H with a nucleophilic alkali‐metal salt and 18‐crown‐6. Further study on its reactivity by tuning the countercationeffect led to the discovery and development of an efficient, catalytic nucleophilic difluoromethylation of enolizable ketones with Me3SiCF2H by using a combination
[EN] MUSCARINIC RECEPTOR 4 ANTAGONISTS AND METHODS OF USE<br/>[FR] ANTAGONISTES DU RÉCEPTEUR MUSCARINIQUE 4 ET PROCÉDÉS D'UTILISATION
申请人:NEUROCRINE BIOSCIENCES INC
公开号:WO2021158698A1
公开(公告)日:2021-08-12
The present invention relates to compounds of Formula (Ia), pharmaceutically acceptable salts of compounds of Formula (Ia), and pharmaceutical compositions thereof that modulate the activity of the muscarinic acetylcholine receptor M4. Compounds, pharmaceutical salts of compounds, and pharmaceutical compositions of the present invention are directed to methods useful in the treatment or prophylaxis of a neurological disease, disorder, or symptom, and conditions related thereto.
Direct nucleophilic difluoromethylation of enolizable ketones with CHF2TMS/HMPA
作者:Oleg M. Michurin、Dmytro S. Radchenko、Igor V. Komarov
DOI:10.1016/j.tet.2016.01.032
日期:2016.3
reagent Me3SiCF2H enables multigram synthesis of difluoromethyl alcohols in good yields under mild conditions from a number of aldehydes and ketones in the presence of HMPA. This additive makes possible the previously challenging nucleophilic difluoromethylation of enolizable ketones. DMPU can be used as a non-toxic alternative to the HMPA in the difluoromethylation reaction, albeit the yields were slightly