Palladium-catalyzed direct desulfitative C2 arylations of 3-halo-N-protected indoles using (hetero)arenesulfonyl chlorides
作者:Anoir Hfaiedh、Hamed Ben Ammar、Jean-François Soulé、Henri Doucet
DOI:10.1039/c6ob00584e
日期:——
through a direct desulfitative arylation, followed by in situ dehalogenation. While, from 3-bromoindole derivatives, 2-aryl-3-bromoindoles were obtained without debromination, and could be converted into 2,3-diarylindoles through a second palladium coupling. This method allows one to prepare in a few steps a very wide variety of indole derivatives, which are of interest in the synthesis of bioactive molecules
研究了N-保护的3-卤代吲哚衍生物与苯磺酰氯作为偶合伙伴的直接芳基化反应,使用的是1,4-二恶烷中5 mol%的双(乙腈)二氯钯(II)催化剂和碳酸锂作为碱。我们证明了吲哚基C3位置的碘和氯取代基均充当临时的封闭基团,允许通过直接的脱硫芳基化反应形成2-芳基吲哚,然后进行原位形成脱卤。而从3-溴吲哚衍生物中,没有脱溴就获得了2-芳基-3-溴吲哚,并且可以通过第二钯偶联将其转化为2,3-二芳基吲哚。该方法允许人们在几个步骤中制备非常广泛的吲哚衍生物,这在生物活性分子的合成中是令人关注的。