Facile synthesis of 2-arylmethylindoles and 2-vinylic indoles through palladium-catalyzed heteroannulations of 2-(2-propynyl)aniline and 2-(2-propynyl)tosylanilide
作者:Bimolendu Das、Priyanka Kundu、Chinmay Chowdhury
DOI:10.1039/c3ob41961d
日期:——
A facile method for the general synthesis of 2-arylmethylindoles has been developed through the reaction of 2-(2-propynyl)aniline or 2-(2-propynyl)tosylanilide with aryl iodides in the presence of Pd(OAc)2, PPh3, and DBU. 2-(2-Propynyl)tosylanilide is found to be reactive also towards electron deficient alkenes in the presence of Pd(OAc)2 and sodium iodide under an oxygen atmosphere, providing easy access to 2-vinylic indoles which possess exclusive E-stereochemistry in the side chain double bond. Operational simplicity, compatibility of the various functional groups, and ease of product formation are the hallmarks of these methods. A mechanism has been proposed to explain the product formation.
通过2-(2-丙炔基)苯胺或2-(2-丙炔基)对甲苯磺酰苯胺与芳基碘化物在Pd(OAc)2、PPh3和DBU存在下的反应,开发了一种简便的2-芳甲基吲哚通用合成方法。在Pd(OAc)2和碘化钠存在下,2-(2-丙炔基)对甲苯磺酰苯胺在氧气氛围中也能与缺电子烯烃反应,为具有侧链双键专属E-立体化学的2-乙烯基吲哚提供了简便的合成途径。操作简便性、各种官能团的兼容性以及产物形成的便捷性是这些方法的特点。我们提出了一种机理来解释产物的形成。