Ketenes generated during the thermal decomposition of 5-[(N-aryl/alkylamino)(hydroxyl)methylene]-2,2-dimethyl-1,3-dioxa-4,6-diones react with highly electrophilic iminium ions. The initial [2+2] cycloaddition product rearranges to 2-arylidene malonamide. Mechanistic aspects of the process are presented.
The invention relates to substituted indole Mannich bases of formula (I), a method for the production thereof, medicaments containing said compounds and the use of said compounds in the production of medicaments, especially medicaments that are used to treat pain. In formula (I), R1,R2, R4-R7 have the meanings cited in claim 1, R3=formula (a) and R13=(substituted) phenyl.
The present invention relates to substituted indole Mannich bases, processes of preparing substituted indole Mannich base, a medicament containing the same, and a pharmaceutical composition containing the same.