作者:Percy S. Manchand、Robert A. Micheli、Sandra J. Saposnik
DOI:10.1016/s0040-4020(01)88308-3
日期:1992.1
An efficient synthesis of the leukotriene antagonist ablukast (5) has been achieved starting from 2,4-dihydroxyacetophenone. The latter, on a Claisen condensation with ethyl oxalate, followed by hydrogenation, gave the chromane ester 7, which was subjected to a Fries rearrangement (AcOH/BF3·OEt2) and the product, after transesterification with methanol, was alkylated with 5-bromo-1-pentanyl acetate
从2,4-二羟基苯乙酮开始,有效地合成了白三烯拮抗剂abukastast(5)。后者在与草酸乙酯的Claisen缩合反应中进行氢化,然后氢化,得到苯二甲酸酯7,使其进行弗里斯重排(AcOH / BF 3 ·OEt 2),然后在与甲醇进行酯交换反应后,将其与5烷基化。 -溴-1-戊基乙酸酯得到乙酸酯9。在氢氧化四正丁基铵存在下用甲醇进行的新型甲醇9甲醇分解反应,然后将衍生的醇进行甲磺酰化,得到甲磺酸酯10。苯乙酮衍生物的烷基化16在三(3,6-二氧杂庚基)胺存在下,使用K 2 CO 3与10进行反应,并进行皂化,得到5。