Patent ID: 7524967

Claim:
A production method of a 5-(2′-pyridyl)-2-pyridone compound represented by the formula (VI) wherein R 2 , R 3 and R 4 are each a hydrogen atom, an alkyl group optionally having substituent(s), an aryl group optionally having substituent(s), an alkoxy group optionally having substituent(s) or an aryloxy group optionally having substituent(s), or R 2 and R 3 optionally form, together with a carbon atom bonded thereto, a ring optionally having substituent(s), and R 6 , R 7 , R 8 and R 9 are each a hydrogen atom, an alkyl group optionally having substituent(s) or an aryl group optionally having substituent(s), or R 6 and R 7 , R 7 and R 8 , or R 8 and R 9 optionally form, together with a carbon atom bonded thereto, a ring optionally having substituent(s), which comprises reacting a pyridine compound represented by the formula (I) wherein R 1 is an alkyl group optionally having substituent(s) or an aryl group optionally having substituent(s), and R 2 , R 3 and R 4 are as defined above, with a brominating agent to give a 5-bromopyridine compound represented by the formula (II) wherein R 1 , R 2 , R 3 and R 4 are as defined above, reacting the obtained 5-bromopyridine compound (II) with a metallizing agent to give an organometallic compound represented by the formula (III) wherein M is a metal atom belonging to group 1 of the periodic table, and R 1 , R 2 , R 3 and R 4 are as defined above, reacting the obtained organometallic compound (III) with a 2-sulfonylpyridine compound represented by the formula (IV) wherein R 5 is an alkyl group optionally having substituent(s) or an aryl group optionally having substituent(s), and R 6 , R 7 , R 8 and R 9 are as defined above, to give a 6-alkoxy-3,2′-bipyridine compound represented by the formula (V) wherein R 1 , R 2 , R 3 , R 4 , R 6 , R 7 , R 8 and R 9 are as defined above, and hydrolyzing the obtained 6-alkoxy-3,2′-bipyridine compound (V).