Ammonia → 4-Piperidinylmethyl 4-amino-5-chloro-2-methoxybenzoate

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Reaction Conditions

Reaction Steps

A mixture of intermediate 10 (18 g) in HCl (25 ml) and THF (250 ml) was stirred for 30 minutes at 70° C. The reaction mixture was cooled, alkalized with aqueous ammonia and the layers were separated. The aqueous layer was extracted twice with THF. The combined organic layers were dried, filtered and the solvent was evaporated. The residue was purified by column chromatography over silica gel (eluent: CH2Cl2/(CH3OH/NH3) 90/10). The pure fractions were collected and the solvent was evaporated. The residue (10 g) was dissolved in CHCl3, washed with aqueous ammonia, dried, filtered and the solvent was evaporated. The residue was suspended in DIPE, filtered off and dried, yielding 8.5 g (65%) 4-piperidinylmethyl 4-amino-5-chloro-2-methoxybenzoate (intermediate 11).

Provenance & Evidence