A direct synthesis of several 1,2-disubstituted 4-, 5-, 6-, and 7-azaindoles from available amino-o-halopyridines is described. This procedure involves a palladium-catalyzed N-arylation followed by a Sonogashira reaction and subsequent cyclization in a one-pot manner, exhibiting a wide scope and compatibility with electron-withdrawing and electron-donating groups. The strategy represents an advancement in azaindole chemistry with a straightforward approach toward 1,2-disubstituted azaindoles, while avoiding complex N-arylations of hindered 2-substituted azaindoles and difficult purification steps of intermediates.

中文翻译：

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氨基邻卤代吡啶通过N-芳基化/ Sonogashira /环化反应一锅法合成1,2-二取代的4-，5-，6-和7-氮杂吲哚

若干直接合成1,2-二取代的4-，5-，6-，从可用氨基和7-氮杂吲哚ö -halopyridines进行说明。该方法涉及钯催化的N-芳基化，然后进行Sonogashira反应，随后以一锅法进行环化，表现出广泛的范围并且与吸电子和供电子基团相容。该策略代表了直接向1,2-二取代的吲哚吲哚类化合物迈进的吲哚化学的进步，同时避免了受阻的2-取代的吲哚类化合物的复杂N-芳基化和中间体的困难纯化步骤。