Hydrochloric Acid → HCID 131718780, compound

Participants

Reaction Steps

A mixture of 2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl phthalimide (4.6 gm, 11.7 mmol) and hydrazine monohydrate (1.17 gm, 23.4 mmol) in methanol (50 ml) was heated at reflux overnight. At the end of the reaction, methanol was removed to leave a crude solid. This was stirred with water (15 ml) and acidified with HCl to pH=2. The insolubles were filtered. The aqueous solution was basified with 50% NaOH then extracted with DCM (2×250 ml). The DCM solution was washed with brine and dried over MgSO4. The solvent was removed to produce a colorless oil: 2.12 gm. This oil was treated with a solution of fumaric acid (935 mg, 1.0 eq) in ethanol. The salt crystallized out: 0.99 gm, m.p.=203°-205° C. A second crop of 0.73 gm (m.p.=198°-200° C.) was collected later.

Provenance & Evidence