Patent ID: 6881842

Claim:
A process for producing a compound represented by the formula: wherein the symbols are as defined hereinafter, or a salt thereof, which comprises: reacting a compound represented by the formula: wherein one of the ring A and the ring B is a 5- to 9-membered aromatic or non-aromatic heterocyclic ring containing 1 to 3 hetero atom(s) selected from a nitrogen atom, an oxygen atom and a sulfur atom, which may be substituted with 1 to 5 substituent(s) selected from a halogen atom, a nitro group. a cyano group, an oxo group, a hydroxy group, a C 1-6 alkyl group, a C 1-4 alkoxy group, a C 1-4 alkylthio group, an amino group, a mono-or di-C 1-4 alkylamino group, a 5- to 7-membered cyclic amino group which may have 1 to 3 hetero atom(s) selected from a nitrogen atom, an oxygen atom and a sulfur atom in addition to carbon atoms and one nitrogen atom, a C 1-4 alkyl-carbonylamino group, a C 1-4 alkylsulfonylamino group, a C 1-4 alkoxy-carbonyl group, a carboxyl group, a C 1-4 alkyl-carbonyl group, a carbamoyl group, a mono- or di-C 1-4 alkyl-carbamoyl group, and a C 1-6 alkylsulfonyl group, and the other is a 5- to 8-membered aromatic or non-aromatic heterocyclic ring containing 1 to 3 atom(s) selected from a nitrogen atom, an oxygen atom and a sulfur atom or a 5- to 8-membered saturated or unsaturated carbocyclic ring, which may be substituted with 1 to 5 substituent(s) selected from a halogen atom, a nitro group, a cyano group, an oxo group, a hydroxy group, a C 1-6 alkyl group, a C 1-4 alkoxy group, a C 1-4 alkylthio group, an amino group, a mono-or di-C 1-4 alkylamino group, a 5- to 7-membered cyclic amino group which may have 1 to 3 hetero atom(s) selected from a nitrogen atom, an oxygen atom and a sulfur atom in addition to carbon atoms and one nitrogen atom, a C 1-4 alkylcarbonylamino group, a C 1-4 alkylsulfonylamino group, a C 1-4 alkoxy-carbonyl group, a carboxyl group, a C 1-6 alkyl-carbonyl group, a carbamoyl group, a mono- or di-C 1-4 alkyl-carbamoyl group, and a C 1-6 alkylsulfonyl group, or a salt thereof, with a compound represented by the formula: wherein R is a hydrogen atom, an optionally substituted alkyl group or an optionally substituted acyl group, and n is an integer of 1 to 6, or a salt thereof, in the presence of a phosphorus compound.