One-Pot Synthesis of 1,2-Disubstituted 4-, 5-, 6-, and 7-Azaindoles from Amino-<i>o</i>-halopyridines via N-Arylation/Sonogashira/Cyclization Reaction
作者:Sara I. Purificação、Marina J. D. Pires、Rafael Rippel、A. Sofia Santos、M. Manuel B. Marques
DOI:10.1021/acs.orglett.7b02403
日期:2017.10.6
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
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。