| abstract |
The present invention is a process for the preparation of a compound of formula (1), in step 1, and step 1 of reacting a compound of formula (2) and a compound of formula (3) below in the presence of a Lewis acid to obtain an adduct. A method comprising step 2 of reacting the obtained adduct and hydrazine to obtain a compound of formula (1) is provided: In the formula, X represents a hydrogen atom or the like, Y represents a hydrogen atom or the like; In the formula, R represents a hydrogen atom or the like; . |