Synthesis, and Cyclization to Aurones and Flavones, of Alkoxy-Substituted Aryl, Arylalkynyl Ketones
作者:Penelope J. Kerr、Simon M. Pyke、A. David Ward
DOI:10.1071/ch07348
日期:——
corresponding aryl alkoxylarylalkynyl ketones in which one of the benzyl groups has been removed. Cyclization of these phenolic ketones using basic reagents (potassium carbonate in acetone is best) provides the corresponding aurone system. When the phenolic group of the alkynyl ketones is protected as the t-butyldimethylsilyl ether followed by cyclization, using 18-crown-6 and potassium fluoride, mixtures
1,3,5-三苄氧基苯与烷氧基取代的苯丙酰氯的酰化提供相应的芳基烷氧基芳基炔基酮,其中一个苄基已被除去。使用碱性试剂(丙酮中的碳酸钾最好)环化这些酚酮提供相应的 aurone 系统。当炔基酮的酚基被保护为叔丁基二甲基甲硅烷基醚,然后使用 18-crown-6 和氟化钾进行环化时,产生相应的黄酮和黄酮的混合物。酮类形成的副产物是相应的 β-氯查耳酮,它也可以在碱性条件下环化为 aurone 产物。相似地,