Baeyer–Villigeroxidation of cyclobutanones is achieved in current developed protocol with 10-methylacridinium perchlorate (AcrH+ClO4−) as a novel organocatalyst both with irradiation at room temperature and without irradiation at elevated temperature. Excellent yields of the corresponding lactones are obtained and the possible mechanism has been proposed.
Directing-Group-Based Strategy Enabling Intermolecular Heck-Type Reaction of Cycloketone Oxime Esters and Unactivated Alkenes
作者:Yi Deng、Chunyang Zhao、Yu Zhou、Hongwei Wang、Xuexiang Li、Gui-Juan Cheng、Junkai Fu
DOI:10.1021/acs.orglett.0c00963
日期:2020.5.1
A new type of coupling between unactivated olefins and nonstabilized alkyl radicals was achieved, which enabled the first intermolecularHeck-typereaction of cycloketone oxime esters and unactivated alkenes. This directing-group-based strategy was compatible with various unactivated alkenes and cyclobutanone-, cyclopentanone-, and cyclohexanone-derived oxime esters. Density functional theory calculations
Amino-5-[4-(difluoromehtoxy)phenyl]-5-phenylimidazolone compounds for the inhibition of beta-secretase
申请人:Malamas Sotirios Michael
公开号:US20070072925A1
公开(公告)日:2007-03-29
The present invention provides a 2-amino-5-[4-(difluoromethoxy)phenyl]-5-phenylimidazolone compound of formula I
The present invention also provides methods for the use thereof to inhibit β-secretase (BACE) and treat β-amyloid deposits and neurofibrillary tangles.
AMINO-5-[4-(DIFLUOROMETHOXY)PHENYL]-5-PHENYLIMIDAZOLONE COMPOUNDS FOR THE INHIBITION OF BETA-SECRETASE
申请人:Malamas Michael Sotirios
公开号:US20090048320A1
公开(公告)日:2009-02-19
The present invention provides compounds and methods for the use thereof to inhibit β-secretase (BACE) and treat β-amyloid deposits and neurofibrillary tangles.
A one-potchemoenzymatic method has been described for the synthesis of γ-butyrolactones starting from the corresponding ketones through a Baeyer–Villiger reaction. The approach is based on a lipase-catalyzed perhydrolysis for the formation of peracetic acid, which is the responsible for the ketone oxidation. Optimization studies have been performed in the oxidation of cyclobutanone, finding Candida