Facile Regioselective Synthesis of Functionalized Heterocycle-Tethered Spiro Compounds via an Intramolecular Electrophilic Ipso-Iodocyclization Process
作者:K. Majumdar、Tapas Ghosh、Pranab Shyam
DOI:10.1055/s-0031-1289526
日期:2011.11
A general, regioselective, and efficient intramolecular electrophilic ipso-iodocyclization of a series of N-alkyl-N-aryl phenylpropiolamides in the presence of I2 (molecular iodine) and NaHCO3 via 5-endo-dig mode of cyclization has been developed for the synthesis of hitherto unreported coumarin, quinolone, and pyrimidine-annelated heterocycliccompounds in excellent yields (84-92%). The development
Iron/Palladium-Catalyzed Intramolecular Hydroamination: An Expedient Synthesis of Pyrrole-Annulated Coumarin and Quinolone Derivatives
作者:K. Majumdar、Nirupam De、B. Roy
DOI:10.1055/s-0030-1258311
日期:2010.12
A highly efficient intramolecular hydroamination reaction of heterocycle-centered aminoalkynes using both substituted and free amines catalyzed by PdCl2/FeCl3 catalytic system to form the biologically important pyrrolocoumarin and pyrroloquinolone derivatives is reported. The use of both aliphatic and aromatic substituted alkynes with different heterocyclic skleton in this strategy demonstrated the
A new strategy for the synthesis of coumarin- and quinolone-annulated pyrroles via Pd(0) mediated cross-coupling followed by Cu(I) catalyzed heteroannulation
作者:K.C. Majumdar、Shovan Mondal
DOI:10.1016/j.tetlet.2008.02.044
日期:2008.4
The sequential coupling and cyclization reactions between aryl halides and (trimethylsilyl) acetylene (TMSA) with concurrent elimination of the TMS substituent, allows a straightforward synthesis of substituted pyrano[3,2-e]indolone and pyrrolo[3,2-f]quinolone derivatives in excellent yields. (C) 2008 Elsevier Ltd. All rights reserved.