Palladium-Catalysed Multicomponent Aminocarbonylation of Aryl or Heteroaryl Halides with [Mo(CO)<sub>6</sub>] and Aryl- or Heteroarylamines Using Conventional Heating
作者:Agathe Begouin、Maria-João R. P. Queiroz
DOI:10.1002/ejoc.200900167
日期:2009.6
synthesized in short reaction times by palladium-catalysedmulticomponentaminocarbonylation of either electron-deficient or electron-rich heteroarylhalides and p-iodoanisole with several arylamines bearing either electron-donating or -withdrawing groups and aminopyridines using [Mo(CO)6] as a solid CO source and conventionalheating. Starting from heteroaryl bromides, a palladacycle with tBu3PHBF4
二(杂)芳基酰胺已通过钯催化的多组分氨基羰基化反应合成缺电子或富电子杂芳基卤化物和对碘苯甲醚与几种带有给电子或吸电子基团的芳胺和氨基吡啶,使用 [Mo (CO)6] 作为固体 CO 源和常规加热。从杂芳基溴化物开始,需要以 tBu3PHBF4 作为配体的钯环以及作为碱的二恶烷中的 DBU 和 125°C 的温度。来自(杂)芳基碘化物、不含配体的 Pd(OAc)2 和 DBU 在 110 °C 下用于二恶烷中。在后一种条件下,我们能够将此反应应用于失活的氨基吡啶以获得相应的二(杂)芳基酰胺。我们已经证明这些反应可以在常规加热(110-125°C)下进行,以在较短的反应时间(1-3 小时)内以中等至高产率产生相应的二(杂)芳基酰胺,而无需兆瓦辐照。2-碘苯甲酸或2-碘苯甲酸甲酯与对茴香胺通过一步羰基化环化反应得到了N-取代的异吲哚啉-1,3-二酮。因此,我们使用常规加热将这种钯催化的氨基羰基化反应的范围与
Direct Transformation of Alkylarenes into
<i>N</i>
‐(Pyridine‐2‐yl)amides by C(sp
<sup>3</sup>
)–C(sp
<sup>3</sup>
) Bond Cleavage
A mild and green methodology for the construction of N‐(pyridine‐2‐yl)amides from alkylarenes and 2‐aminopyridine in one step was developed. Various alkylarenes were directly transformed into the corresponding N‐(pyridine‐2‐yl)amides through tandem C(sp3)–H bond activation/oxidative cyclization/C–C bondcleavage.
An efficient and chemoselective C(sp(2))-N bond cleavage of aromatic imidazo[1,2-a]pyridine molecules is developed. A broad scope of amide compounds such as alpha-ketoamides and N-(pyridin-2-yl)arylamides are afforded as the final products in up to quantitative yields. Diverse C-N bond cleavages are controlled by the oxidative species used in this transformation, with various amide products afforded in a chemoselective fashion. A preliminary study indicated that some alpha-ketoamides exhibit anti-Tobacco Mosaic Virus activity for potential use in plant protection.