| 摘要 |
PROBLEM TO BE SOLVED: To provide 2-pyridone compounds substituted with a phenoxy group useful as intermediates of medicines and agricultural chemicals. SOLUTION: 2-Pyridone compounds substituted with a phenoxy group at 3-position can be prepared by a reaction of an amide compound represented by formula (1) (wherein R represents an optionally substituted phenyl group) and a malon aldehyde derivative (e.g. 3-alkoxypropenal, 3,3-dialkoxypropanal, 1,3,3-trialkoxy-1-propene or 1,1,3,3-tetraalkoxypropane) in the presence of a protonic acid (e.g. sulfuric acid, a trihaloacetic acid or a sulfonic acid). COPYRIGHT: (C)2004,JPO
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