反应详情

Similarly, m-hydroxyaniline and o-hydroxyaniline are reacted with an equimolar amount of 3,5-diacetyl-4,6-dihydroxy-2H-pyran-2-one in methanol to give the respective products, 5-acetyl-4-hydroxy-3-[1-(m-hydroxyphenylamino)ethylidene]-2H-pyran-2,6(3H)-dione, m.p. 213°-216° C., and 5-acetyl-4-hydroxy-3-[1-(o-hydroxyphenylamino)ethylidene]-2H-pyran-2,6(3H)-dione, m.p. 210°-212° C.