Microwave-Assisted One-Pot Synthesis of Pyrazolo[3,4-b]indoles and New Isoxazolo[5,4-b]indoles via Copper-Catalyzed Intramolecular C-N/C-O Bond Formation
作者:Rajagopal Nagarajan、Arepalli Kumar、P. Rao
DOI:10.1055/s-0031-1289572
日期:2011.12
A facile one-pot, two-step synthesis of highly substituted pyrazolo[3,4-b]indoles and isoxazolo[5,4-b]indoles was developed via microwave-assisted, copper-catalyzed intramolecular heterocyclization (involving C-N/C-O bond formation) from 3-acetyl-2-chloroindoles in good to excellent yields. coppercatalysis - 3-acyl-2-chloroindoles - pyrazolo[3,4-b]indoles - isoxazolo[5,4-b]indoles - intramolecular
通过微波辅助,铜催化的分子内杂环键合(涉及CN / CO键),开发了一种容易的一锅两步合成高度取代的吡唑并[3,4- b ]吲哚和异恶唑并[5,4- b ]吲哚的方法。 (3-乙酰基-2-氯吲哚)的合成,收率高至优异。 铜催化-3-酰基-2-氯吲哚-吡唑并[3,4- b ]吲哚-异恶唑并[5,4- b ]吲哚-分子内杂芳基化
Efficient Routes to Pyrazolo[3,4-<i>b</i>]indoles and Pyrazolo[1,5-<i>a</i>]benzimidazoles via Palladium- and Copper-Catalyzed Intramolecular C−C and C−N Bond Formation
Efficient synthetic routes to pyrazolo[3,4-b]indoles and pyrazolo[1,5-a]benzimidazoles via intramolecular palladium- and copper-catalyzed cyclization of 1-aryl/1-unsubstituted 5-(2-bromoanilino)-pyrazole precursors via intramolecular C-C and C-N bond formation have been reported.