Entry into (E)-3-(1,2,4-oxadiazol-5-yl)acrylic acids via a one-pot ring-opening/ring-closing/retro-Diels-Alder reaction sequence
作者:Sofia Presnukhina、Marina Tarasenko、Sergey Baykov、Sergey N. Smirnov、Vadim P. Boyarskiy、Anton Shetnev、Mikhail K. Korsakov
DOI:10.1016/j.tetlet.2019.151543
日期:2020.2
and convenient one-pot method is reported for the synthesis of (E)-3-(3-aryl(heteroaryl, alkyl)-1,2,4-oxadiazole-5-yl)acrylic acids utilizing readily accessible or commercially available substituted benzamidoximes and inexpensive exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride. The method is based on the reaction of amidoximes with the anhydride in a basic medium at RT followed by an acid-catalyzed
据报道一种简单方便的一锅法,利用易于获得或可商购的方法合成(E)-3-(3-芳基(杂芳基,烷基)-1,2,4-恶二唑-5-基)丙烯酸。取代的苯甲酰胺肟和廉价的exo -3,6-环氧-1,2,3,6-四氢邻苯二甲酸酐。该方法基于在室温下碱性介质中in胺肟与酸酐的反应,然后进行酸催化的逆-Diels-Alder反应。观察到的立体选择性杂环化/逆-Diels-Alder级联过程适用于合成各种取代的(E)-1,2,4-恶二唑-5-基丙烯酸,其芳基部分具有供电子基团和吸电子基团,并且在1,2,4-恶二唑环的3位具有杂芳基或烷基取代基(42-79 %; 15个示例)。