An Efficient Method for the Preparation of Enantiomerically Pure N-Acylarylsulfonamides Having an Asymmetric Center at the α-Position: Condensation of Acid Chlorides and Arylsulfonamides Under Solid-Liquid Two-Phase Conditions
Novel AC regioisomer cationic cyclodextrins have been successfully prepared with azide/alkyne click chemistry. The clicked CDs were explored for the enantioseparation of acidic racemates in capillary electrophoresis.
Low-Temperature Synthesis of Methylphenidate Hydrochloride
申请人:Huntley C. Frederick M.
公开号:US20150038720A1
公开(公告)日:2015-02-05
The present invention describes a process for the preparation of methylphenidate hydrochloride. The process involves the esterification of ritalinic acid and methanol in the presence of an acid catalyst at a low temperature. The process may optionally involve the addition of an orthoester.
The invention relates to nitrilases and to nucleic acids encoding the nitrilases. In addition methods of designing new nitrilases and methods of use therefore are also provided. The nitrilases have increased activity and stability at increased pH and temperature.
ORD and CD measurements on α-alkylphenylaceticacids with primary, secondary, and tertiary α-substituents agree with the evidence from gas chromatographie retention times of their diastereoisomeric amides in leading to the conclusion that all (+)- acids of the series possess the same configuration.