Isotope effects in nucleophilic substitution reactions. IV. The effect of changing a substituent at the α carbon on the structure of S<sub>N</sub>2 transition states
作者:Kenneth Charles Westaway、Zbigniew Waszczylo
DOI:10.1139/v82-360
日期:1982.10.1
Kinetic studies, secondaryα-deuterium kinetic isotopeeffects, primary chlorine kinetic isotopeeffects (1), Hammett ρ values determined by changing the substituent in the nucleophile, and activation parameters have been used to determine the detailed (relative) structures of the transition states for the SN2 reactions between para-substituted benzyl chlorides and thiophenoxide ion. A rationale for
This invention also provides compound of Formula (I) including pharmaceutical compositions comprising a compound of Formula (I) and a pharmaceutically acceptable carrier. This invention also provides the use of such compounds and compositions in methods of treating diseases and conditions that are beneficially treated by administering pitolisant. Some exemplary embodiments include a method of treating a disease or condition selected from narcolepsy, daytime sleepiness (particularly in subjects suffering from Parkinson's disease or obstructive sleep apnea syndrome), and cognitive defects in psychiatric conditions, the method comprising the step of administering to a subject in need thereof a pharmaceutically acceptable composition of the present invention.
This invention relates to derivatives of 1-(p-chIorobenzyI)-2-(1-pyrrolidinylmethyl)benzimidazole according to Formula I wherein at least one Y is deuterium described herein and pharmaceutically acceptable salts thereof. This invention also provides compositions comprising a compound of this invention and the use of such compositions in methods of treating diseases and conditions that are beneficially treated by administering an inhibitor of hepatitis C virus (HCV) RNA replication.
α,α-Dideuterio benzyl alcohols are importantbuildingblocks for the synthesis of deuterium-labeled medicines and agrochemicals. We have developed the first general single-electron transfer reductive deuteration of readily commercially available aromatic esters for the synthesis of α,α-dideuterio benzyl alcohols using benign D2O and a mild single-electron donor SmI2. This operationally convenient method