Formic Acid → N-(4-Chlorophenyl)-4-methyl-2-((pyridin-3-yloxy)methyl)piperazine-1-carboxamide dihydrochloride

Participants

Reaction Steps

N-(4-chlorophenyl)-2-((pyridin-3-yloxy)methyl)piperazine-1-carboxamide dihydrochloride (prepared as described in Example 7) (141 mg, 0.335 mmol) was dissolved in formaldehyde (37% aqueous solution, 1 mL) and formic acid (1 mL) and heated to 60° C. After 16 h, the reaction mixture was brought to pH 12 with 1 N NaOH in water and was extracted with CH2Cl2 (3×10 mL). The combined organics were dried over Na2SO4, filtered, and concentrated under reduced pressure. The material was purified by HPLC (5 to 30% MeCN/0.1% TFA in H2O/0.1% TFA gradient). The desired fractions were concentrated under reduced pressure, dissolved in MeOH (1 mL) and treated with 4M HCl in 1,4-dioxane. The mixture was concentrated under reduced pressure, yielding 10.3 mg (7%) of the desired product as a white solid. LC-MS: RT=4.48 min, [M+H]+=361.1.

Provenance & Evidence