Methoxyamine is the organic compound with the formula CH<sub>3</sub>ONH<sub>2</sub>. Also called O-methylhydroxylamine, it is a colourless volatile liquid that is soluble in polar organic solvent and in water. It is a derivative of hydroxylamine with the hydroxyl hydrogen replaced by a methyl group. Alternatively, it can be viewed as a derivative of methanol with the hydroxyl hydrogen replaced by an amino group. It is an isomer of N-methylhydroxylamine and aminomethanol.
Methoxyamine is prepared via O-alkylation of hydroxylamine derivatives. For example, it is obtained by O-methylation of acetone oxime followed by hydrolysis of the O-methylated oxime:
The other broad method involves methanolysis of hydroxylamine sulfonates:
Commercial products are usually the hydrochloride salt.
Analogous to the behavior of hydroxylamine, methoxyamine condenses with ketones and aldehydes to give imines.
Methoxyamine is used as a synthon for NH<sub>2</sub><sup>+</sup>. It undergoes deprotonation by methyl lithium to give CH<sub>3</sub>ONHLi. This N-lithio derivative is attacked by organolithium compounds to give, after hydrolysis, amines:
Methoxyamine has potential medicinal uses. It covalently binds to apurinic/apyrimidinic (AP) DNA damage sites and inhibits base excision repair (BER), which may result in an increase in DNA strand breaks and apoptosis.This agent may potentiate the anti-tumor activity of alkylating agents.
Examples of drugs incorporating the methoxyamine unit are brasofensine and gemifloxacin.