香豆素类抗凝血药及其类似物的合成

The condensation reaction of 4-hydroxycoumarin with each of ah substituted benzalacetones in（absolute） ethanol gave coumarin analogues which were subsequently converted to their ethyl ethers(cyclocou-（marin）).The ethers can be quantitatively converted back to the coumarin analogues by acid hydrolysis.Four of them are new substances.The reaction mechanism is discussed in detail.All the products were characterized by HPLC,IR and 1H NMR.Compared with the present process in the literature,the process for the synthesis of the coumarin analogues is obviously improved on the reaction time,temperature,solvent,（catalyst）,and post-treatment.