The present specification provides a total synthesis of known intermediates useful in the synthesis of khellin and antiatherosclerotic analogs thereof. 3-Furoic acid is treated with succinic anhydride and diesterified to 3-carboxy-.delta.-oxo-2-furanbutanoic acid bis (alkyl ester). Following amination, cyclization and bis methylation, 6-formyl-4,7-dimethoxy-5-benzofurancarboxcyclic acid alkyl ester is prepared. This compound is then converted to known intermediates in the synthesis of khellin and analogs. Further, the present invention provides numerous novel anti-atherosclerotic 4,9-di-(C.sub.2 -C.sub.4)-alkoxyfurochromones.
本说明书提供了一种已知中间体的完整合成方法,该中间体在合成khellin和其抗动脉粥样硬化类似物时非常有用。将3-呋酸与
琥珀酸酐反应,并二酯化为3-羧基-δ-氧代-2-
呋喃丁酸双(烷基酯)。经过
氨基化、环化和双甲基化后,制备了6-甲酰基-4,7-二甲氧基-
5-苯并呋喃羧
环酸烷基酯。然后将该化合物转化为合成khellin和类似物的已知中间体。此外,本发明提供了许多新型抗动脉粥样硬化的4,9-二(C.sub.2-C.sub.4)-烷氧基
呋喃色酮。