作者:Nixarlidis, Christos、Chisholm, John D.
DOI:10.1039/d4ra05265j
日期:——
carbocations formed in this manner are trapped by a pendant carboxylic acid to form a lactone. Indole-3-butyric acids are especially good substrates for the reaction. The lactonization functions well with catalytic amounts of DDQ combined with MnO2 as the stoichiometric oxidant. This cyclization proceeds with a number of indole-3-butyric acids, and yields were generally good as long as the indole was electron
紧邻富电子芳环的苄基 C-H 键容易受到 2,3-二氯-5,6-二氰基-1,4-苯醌 (DDQ) 促进的官能化。在这项工作中,以这种方式形成的苄基碳正离子被侧链羧酸捕获以形成内酯。吲哚-3-丁酸是该反应特别好的底物。使用催化量的DDQ与作为化学计量氧化剂的MnO 2组合,内酯化作用良好。这种环化作用是用许多吲哚-3-丁酸进行的,只要吲哚富含电子并且在反应的苄基碳附近没有大的取代基,产率通常就很好。用吸电子基团官能化的吲哚-3-丁酸往往会产生更适中的产率。只要芳香环被给电子基团官能化,其他芳香族底物也参与其中。