observed in the reduction of hinderedketones such as isopropyl ketone, while the stereoselectivity was inverted in the reduction of ketones with electron-withdrawing atoms such as chlorine. The mechanism for the inversion in stereochemistry was investigated by enzymatic studies. Several enzymes with different stereoselectivities were isolated; one of them catalyzed the reduction of methyl ketones, and another
Homologation of Electron-Rich Benzyl Bromide Derivatives via Diazo C–C Bond Insertion
作者:Atanu Modak、Juan V. Alegre-Requena、Louis de Lescure、Kathryn J. Rynders、Robert S. Paton、Nicholas J. Race
DOI:10.1021/jacs.1c11503
日期:2022.1.12
The ability to manipulate C–C bonds for selective chemical transformations is challenging and represents a growing area of research. Here, we report a formal insertion of diazo compounds into the “unactivated” C–C bond of benzyl bromide derivativescatalyzed by a simple Lewisacid. The homologation reaction proceeds via the intermediacy of a phenonium ion, and the products contain benzylic quaternary
[EN] GLYCINE DERIVATIVES AND THEIR USE AS MUSCARINIC RECEPTOR ANTAGONISTS<br/>[FR] DÉRIVÉS DE GLYCINE ET LEUR UTILISATION EN TANT QU'ANTAGONISTES DES RÉCEPTEURS MUSCARINIQUES
申请人:CHIESI FARMA SPA
公开号:WO2012069275A1
公开(公告)日:2012-05-31
The present invention relates to alkaloid aminoester derivatives acting as muscarinic receptor antagonists, processes for their preparation, compositions comprising them and therapeutic uses thereof.
本发明涉及作为肌碱受体拮抗剂的生物碱氨酯衍生物,其制备方法,包含它们的组合物以及它们的治疗用途。
Different stereochemistry for the reduction of trifluoromethyl ketones and methyl ketones catalyzed by alcohol dehydrogenase from Geotrichum
Reduction of trifluoromethyl ketones by a crude alcohol dehydrogenase from Geotrichum afford (S)-trifluoromethyl carbinols in excellent ee, whereas the reduction of methyl ketones gives the corresponding alcohols of the opposite configuration in excellent ee.
Hörner–Wadsworth–Emmons reagents 3 and ketones 2 with a perfluoroalkyl (Rf) moiety prepared in situ was proved to be significantly efficient and powerful methods for the construction of a wide variety of α,β-unsaturatedesters with Rf and R1 groups both at the β-position due to convenient avoidance of usually tedious as well as troublesome isolation steps of these ketones 2.