Provided is a levodopa prodrug that overcomes the problems attributed to the blood kinetics of levodopa such as large number of doses and the incidence of side effects due to frequent dosing. (2S)-2-Amino-3-(3,4-bis((2-(benzoyloxy)-2-methylpropanoyl)oxy)phenyl)propanoic acid, a salt thereof, or a solvate thereof is a levodopa prodrug, and provides a flat blood concentration-time profile of levodopa through oral administration, and therefore is useful as a preventive and/or therapeutic agent for Parkinson's disease and/or Parkinson's syndrome that overcomes the problems associated with pharmaceutical preparations of levodopa.
Nickel-Catalyzed Site-Selective Amidation of Unactivated C(sp<sup>3</sup>)H Bonds
作者:Xuesong Wu、Yan Zhao、Haibo Ge
DOI:10.1002/chem.201403356
日期:2014.7.28
nickel‐catalyzed CH bond functionalization process with the assistance of a bidentatedirectinggroup. The reaction favors the CHbonds of β‐methyl groups over the γ‐methyl or β‐methylene groups. Additionally, a predominant preference for the β‐methyl CHbonds over the aromatic sp2 CHbonds was observed. Moreover, this process also allows for the effective functionalization of benzylic secondary sp3 CH bonds
A palladium-catalyzed cyclization of the β-C(sp3)–H bond of aliphatic carboxylic acids with allylic electrophiles providing five-membered γ-lactones in good to excellent yields is demonstrated. An acetyl-protected aminoethyl phenyl thioether ligand is used to promote the C–H activation reaction. A diverse range of allylic electrophiles such as allyl alcohols, allyl acetates, allyl sulfones, allyl phosphonate