Patent ID: 7541459

Claim:
A method of producing a compound represented by the following formula (4) or a tautomer thereof, the process comprising reacting a compound represented by the following formula (5) or a tautomer thereof with a compound represented by the following formula (6) in the presence of an aluminum alkoxide compound: wherein R 41 and R 45 each independently represent a substituent selected from the group consisting of: an alkyl group, an alkenyl group, an alkinyl group, an aralkyl group, an aryl group, a heterocyclic group, a halogen atom, a hydroxyl group, an alkoxy group, an aryloxy group, a silyloxy group, a heterocyclic oxy group, an alkylthio group, an arylthio group, a heterocyclic thio group, an alkylsulfinyl group, an arysulfinyl group, an alkylsulfonyl group, an arysulfonyl group, a phosphino group, a phosphinyl group, a phosphinyloxy group, and a silyl group; R 42 , R 43 and R 44 each independently represent a hydrogen atom, an aliphatic group, an aromatic group or a heterocyclic group; R 51 represents an aliphatic group, an aromatic group or a heterocyclic group; n 41 denotes an integer from 0 to 4; n 45 denotes an integer from 0 to 5; when n 41 is 2 or more, plural R 41 s may be the same or different and may be combined with each other to form a ring; and when n 45 is 2 or more, plural R 45 s may be the same or different and may be combined with each other to form a ring.