Palladium-Catalyzed Chemoselective Monoarylation of Hydrazides for the Synthesis of [1,2,4]Triazolo[4,3-<i>a</i>]pyridines
作者:Andreas Reichelt、James R. Falsey、Robert M. Rzasa、Oliver R. Thiel、Michal M. Achmatowicz、Robert D. Larsen、Dawei Zhang
DOI:10.1021/ol902868q
日期:2010.2.19
efficient and convenient method for the synthesis of [1,2,4]triazolo[4,3-a]pyridines was exemplified by the synthesis of 20 analogues bearing a variety of substituents at the 3-position. The methodology involves a palladium-catalyzed addition of hydrazides to 2-chloropyridine, which occurs chemoselectively at the terminal nitrogen atom of the hydrazide, followed by dehydration in acetic acid under microwave
合成[1,2,4]三唑并[4,3- a ]吡啶的一种有效而方便的方法,是通过合成20个在3位带有取代基的类似物来举例说明的。该方法包括将钯催化的酰肼加成至2-氯吡啶,其在酰肼的末端氮原子上发生化学选择性,然后在微波辐射下于乙酸中脱水。