| 摘要 |
<p>A method for preparing 6,7-dihyfroxycoumarin-3- carboxy compound having formula (3), wherein R is H or an alkyl group, being useful as an intermediate of a medicine or the like, which comprises reacting 6,7-methylenedioxycoumarin-3-carboxy compound having formula (1) with molecular chlorine in the presence of a chlorine-containing compound (such as PCl3 and PCl5) to form 6,7-chloromethylenedioxycoumarin-3-carboxy compound having formula (2), and subjecting the 6,7-chloromethylenedioxycoumarin-3-carboxy compound to a hydrolysis reaction or alcoholysis reaction.</p> |
