Method for producing benzoxazole derivative having bicyclic piperazine ring or salt thereof, and method for producing material thereof

Abstract

A method for producing a compound represented by formula (1): or a salt thereof, comprising: a step B of producing a compound represented by formula (3): [in the formula (3), Boc represents a tert-butoxycarbonyl group] or a salt thereof by using a compound represented by formula (2): [in the formula (2), Ra represents a hydrogen atom or an optionally substituted arylmethyl group, Rb represents an optionally substituted alkyl or cyclic alkyl group, R3 represents a hydrogen atom, a halogen atom, or a thiazol-2-yl group, and Xa represents a hydrogen atom or a halogen atom] or a salt thereof; and a step C of producing the compound represented by the formula (1) or the salt thereof by using the compound represented by the formula (3) or the salt thereof.

Dependencies are inferred from the claim text.