Dichloromethane → 1-Piperazinecarboxamide, N-((methylamino)carbonyl)-4-phenyl-

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Reaction Steps

Into 70 ml of dichloromethane, were dissolved 4.1 g of 4-phenylpiperazine-1-carboxamide and 1.2 g of methyl isocyanate. To the solution, while being stirred and cooled in ice, was added dropwise 5.2 g of stannic chloride. After 15 hours of reaction at room temperature, water was added to separate an organic layer. The organic layer was dried over anhydrous sodium sulfate and freed from the solvent by distillation. The residue was recrystallized from ethanol to obtain 2.7 g (51% yield) of 1-(4-methylallophanoyl)-4-phenylpiperazine having a melting point of 198°-200° C.

Provenance & Evidence