Cyclization Routes for the Synthesis of Functionalized Pyrano[2,3-b]indolones, Pyrazolo[3,4-b]indoles, and Furo[2,3-b]indoles
作者:Rajagopal Nagarajan、Arepalli Kumar
DOI:10.1055/s-0032-1316870
日期:——
structures containing pyrano[2,3-b]indol-2(9H)-ones, pyrano[2,3-b]indol-4(9H)-ones, pyrazolo[3,4-b]indoles, and furo[2,3-b]indoles are described. Pyrano[2,3-b]indol-2(9H)-ones are synthesized by three different metal-free syntheses (DCC, DMSO; CDI, DBU, CH2Cl2; or Mukaiyama’s reagent, Et3N, MeCN) and pyrano[2,3-b]indol-4(9H)-ones are prepared by one-pot or two-step synthesis. Pyrazolo[3,4-b]indoles are synthesized
摘要 含吡喃并[2,3 - b ]吲哚-2(9 H)-one,吡喃并[2,3 - b ] indol-4(9 H)-one,吡唑并[3,4- ]的生物活性核心结构的合成描述了b ]吲哚和呋喃[2,3- b ]吲哚。吡喃并[2,3 - b ]吲哚-2(9 H)-1是通过三种不同的无金属合成法合成的(DCC,DMSO,CDI,DBU,CH 2 Cl 2;或Mukakaiyama试剂,Et 3 N,MeCN)一锅或两步合成制备吡喃并[2,3 - b ]吲哚-4(9 H)-1。吡唑啉[3,4- b通过Fischer吲哚型环化合成]吲哚,并使用McMurry偶联来合成呋喃[2,3- b ]吲哚。所有这些核心结构均由简单的常见3-乙酰基吲哚-2-醇合成。 含吡喃并[2,3 - b ]吲哚-2(9 H)-one,吡喃并[2,3 - b ] indol-4(9 H)-one,吡唑并[3,4- ]的生物活性核心结构的合成描述了b