Compounds having the structural formula I
or a pharmaceutically acceptable salt thereof, wherein
R is R
1
-isoxazolyl, R
1
-oxadiazolyl, R
1
-dihydrofuranyl, R
1
-pyrazolyl, R
1
-imidazolyl, R
1
-pyrazinyl or R
1
-pyrimidinyl;
R
1
is 1, 2 or 3 substituents selected from H, alkyl, alkoxy and halo; Z is optionally substituted-aryl, or optionally substituted-heteroaryl; are disclosed, as well as their use in the treatment of central nervous system diseases, in particular Parkinson's disease and Extra Pyramidal Syndrome, pharmaceutical compositions comprising them, and combinations with other agents.
Oxidant controlled regio- and stereodivergent azidohydroxylation of alkenes via I<sub>2</sub> catalysis
作者:P. K. Prasad、R. N. Reddi、A. Sudalai
DOI:10.1039/c5cc02374b
日期:——
A novel, I2 catalyzed regio- and stereodivergent vicinal azidohydroxylation of alkenes leading to 1,2-azidoalcohols in high yields (up to 92%) and excellent dr (up to 98%) has been developed.
α-Dialkylaminomethylphosphines and the corresponding arsines have been obtained by the following methods: (1) by direct Mannich reaction, (2) by reaction of secondary phosphines and arsines with bis(dimethylamino)methane, and (3) by reaction of methyleneammonium halides with secondary phosphines and arsines, silylphosphines and silylarsines, and alkali phosphides and alkali arsides, respectively. The
Preparation of tetraalkylformamidinium salts and related species as precursors to stable carbenes
作者:Roger W. Alder、Michael E. Blake、Simone Bufali、Craig P. Butts、A. Guy Orpen、Jan Schütz、Stuart J. Williams
DOI:10.1039/b104110j
日期:——
Methods are described for the preparation of a range of N,N,N′,N′-tetraalkylformamidinium and N,N-dialkyliminium ions 4–20 as anhydrous salts for use as precursors to diamino- and amino-carbenes. These methods include a novel method involving nucleophilic addition to formamides followed by trapping with electrophiles such as triflic anhydride, various methods of formamide activation, exchange reactions involving orthoesters and the transamination of amidinium salts, and alkylation methods.
Bredereck's Reagent Revisited: Latent Anionic Ring-Opening Polymerization and Transesterification Reactions
作者:Szilárd Csihony、Tristan T. Beaudette、Alan C. Sentman、Gregory W. Nyce、Robert M. Waymouth、James L. Hedrick
DOI:10.1002/adsc.200404097
日期:2004.8
The ring-openingpolymerization of lactide with commercially available Bredereck-type reagents in the presence or absence of alcohol initiators was carried out affording polylactide with controlled molecular weight and narrow polydispersities. An anionic mechanism involving heterolytic cleavage to alkoxides is proposed, where these reagents function as latentanionic initiators for the ring-opening