Sodium Hydroxide → N-[1-(1-methylethyl)-4-piperidinyl]N-phenyl-2-thiopheneacetamide ethanedioate

Participants

Reaction Steps

From 6 parts of N-[1-(1-methylethyl)-4-piperidinyl]-N-phenyl-2-thiopheneacetamide (E)-2-butenedioate, the free base is liberated in the conventional manner with a diluted sodium hydroxide solution. The product is extracted with trichloromethane. The extract is washed with water, dried, filtered and evaporated. The residue is converted into the ethanedioate salt in 2-propanol. The salt is filtered off and dried, yielding 3.2 parts of N-[1-(1-methylethyl)-4-piperidinyl]N-phenyl-2-thiopheneacetamide ethanedioate; mp. 167.4° C.

Provenance & Evidence