By cyclization of ethyl m-methoxybenzimidate (I) with 2-ethylbenzoyl hydrazide (II) at 125 C.
The condensation of ethyl 3-metboxybenzimidate (I) with 2-ethybenzoic hydrazide (II) in refluxing CH2Cl2 gives the benzoylamidrazone (III), which is then cyclized by means of K2CO3 in refluxing 2-etoxyethanol.
A new method for the synthesis of DL-111-IT has been reported: By cyclization of m-methoxybenzonitrile (I) with ethoxybenzoylhydrazide (II) in refluxing methanol.