Substituted sulfonamide compounds corresponding to formula I:
a process for their preparation, pharmaceutical compositions comprising such compounds, and the use of such substituted sulfonamide compounds in pharmaceutical compositions for the treatment of pain or other disorders or diseases that are mediated at least in part by B1R receptors.
A new synthesis of spiropyrrolidine–tetralones via an unexpected formal ring-contraction of 4-disubstituted piperidine to 3-disubstituted pyrrolidine
作者:Upul K. Bandarage、Robert J. Davies
DOI:10.1016/j.tetlet.2010.09.142
日期:2010.12
We have developed an efficient synthesis of novel racemic spiropyrrolidine–tetralones via an unexpected ring-contraction reaction of a 4-disubstituted piperidine to 3-disubstituted pyrrolidine. We suggest that intramolecular quaternization of the piperidine nitrogen of compound 7 occurs to form a bridged bicyclic quaternary ammoniumsalt intermediate 10. The ring opening of 10 with cyanide resulted