Synthesis of indolequinones via a Sonogashira coupling/cyclization cascade reaction
摘要:
A mild strategy for constructing indolequinone motifs is described on the basis of the Sonogashira reaction and a copper-catalyzed intramolecular cyclization cascade reaction. The first step involves the palladium- and copper-catalyzed reaction between halogenated naphthoquinone and terminal acetylene to generate a coupling product, which then reacts in a copper-catalyzed intramolecular cyclization with the nitrogen functional group adjacent to the carbon-carbon triple bond. (C) 2011 Elsevier Ltd. All rights reserved.
合成了一系列2-氮丙啶基和2,3-双(氮丙啶基)-1,4-萘醌基磺酸盐和酰化物衍生物,并评估了其在体外对人疟原虫恶性疟原虫(Vietnam Smith菌株,氯喹)的抗疟活性。 -在R3级别具有抗性)。活性最高的化合物-对位乙基苯磺酸2-叠氮基-1,4-萘醌-5-基(13),对叔丁基苯磺酸2-叠氮基-1,4-萘醌-5-基(48)和2- aziridinyl-5-hydroxy-1,4-naphthoquinone(5)在9.6 x 10(-8),2.4 x 10(-8)和8.8 x 10(-8)时可抑制恶性疟原虫的生长50% M分别。
In this paper, a concise one-pot method for the construction of benzo[f]indole-4,9-dione motifs is described. These transformations proceed via a sequential palladium- and copper-catalyzed coupling reaction of 1,4-naphthoquinones with terminal acetylenes, followed by a copper-catalyzed intramolecular cyclization reaction of the resulting coupling product.