Preparation of thiochromone-3-carboxylic acids
专利汇可以提供Preparation of thiochromone-3-carboxylic acids专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain the titled substance useful as a fungicide for agriculture and gardening by one step in high yield, by reacting an arylthiol with a dialkylalkoxymethylene malonate in polyphosphoric acid, adding water to the reaction system, followed by heating.
CONSTITUTION: Preferably 1mol arylthiol shown by the formulaI(R
1 and R
2 are H, halogen, lower alkyl, or lower alkoxy; or R
1 and R
2 together with C linked to them may form cycloalkyl group or heterocyclic group), wherein at least one ortho position of a mercapto group is H, is reacted with 1W1.5mol dialkylalkoxymethylene malonate shown by the formula II (R
3 and R
4 are lower alkyl) in polyphosphoric acid at a relatively low temperature of 40W80°C, water is added to the reaction system, which is heated at 80°CW the reflux temperature, to give the desired compound shown by the formula III.
COPYRIGHT: (C)1982,JPO&Japio，下面是Preparation of thiochromone-3-carboxylic acids专利的具体信息内容。
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