| abstract |
This invention relates to a procedure for obtaining a thiophene-2-carboxamide compound, specifically rivaroxaban, which comprises the (i) fragmentation of the N=C bond of a compound of formula 23 where R1 is selected among hydrogen, halogen, and (C1-C6)alkyl; and (ii) acylation of the resulting intermediate with 5-chloro-tiofen-2-carbonyl chloride in a solvent medium, in the presence of a base. The invention also relates to the compounds of formula 23 and their use in the obtention of rivaroxaban. |