Three-step synthesis of 2,5,7-trisubstituted indoles from N-acetyl-2,4,6-trichloroaniline using Pd-catalyzed site-selective cross-coupling
作者:Miyuki Yamaguchi、Kei Manabe
DOI:10.1039/c7ob01547j
日期:——
We report a facile three-step synthesis of 2,5,7-trisubstituted indoles from N-acetyl-2,4,6-trichloroaniline, with the first step featuring Pd/dihydroxyterphenylphosphine (DHTP)-catalyzed ortho-selective Sonogashira coupling followed by cyclization to afford 2-substituted 5,7-dichloroindoles. Subsequent introduction of aryl or alkenyl groups at the C7 position was achieved by Pd/DHTP-catalyzed site-selective
Copper-catalyzed construction of eight-membered rings via oxidative ring expansion and intermolecular cyclization sequencing of indoles with amidines: efficient synthesis of benzo[1,3,5]triazocin-6(5H)-ones
作者:Wen-Bin Cao、Xue-Qiang Chu、Yu Zhou、Ling Yin、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1039/c7cc02815f
日期:——
Novel and efficient synthesis of eight-membered nitrogen heterocycles in one pot by copper-catalyzed oxidative ring expansion and intermolecular cyclization sequencing of indoles with amidines has been described. This protocol features easily available substrates and high step-economy. More importantly, dioxygen as the most ideal oxidant was employed under mild reaction conditions. A variety of valuable
Copper(I)-Catalyzed Coupling of Terminal Acetylenes with Aryl or Vinyl Halides
作者:D. Venkataraman、Pranorm Saejueng、Craig G. Bates
DOI:10.1055/s-2005-869893
日期:——
Synthetic protocols using copper(I) catalysts for the for- mation of diaryl acetylenes, 1,3-enynes, benzofurans and indoles are described. The acetylenic moiety is an important unit found in many compounds that are of pharmaceutical, biological and ma- terial interests. 1 Aryl acetylenes are constituent units in important conjugated polymers. 1c 1,3-Enynes are found in many biologically and pharmaceutically
Synthesis of 3,1-Benzothiazines by Cyclisation of 2-Thioformylaminodiphenylacetylenes
作者:David H. Reid、Manuel A. Fernandes
DOI:10.1055/s-2003-42078
日期:——
2-Formylaminodiphenylacetylenes, obtained in excellent yield by Sonogashira coupling of (2-iodoaryl)formamides with phenylacetylene, were thionated with P4S10 in boiling THF to give 2-thioformylaminodiphenylacetylenes. These acetylenes were cyclised by DBU at ambient temperature to give (4Z)-4-benzylidene-4H-3,1-benzothiazines and small amounts of 2-phenylindoles. The structures of (4Z)-4-benzylidene-6,8-dichloro-4H-3,1-benzothiazine and 3,5-dichloro-2-thioformylaminodiphenylacetylene were established by single crystal X-ray analysis.
Methods and systems for preparing fused heterocyclic compounds using copper(I) catalysts
申请人:University of Massachusetts
公开号:US07473786B1
公开(公告)日:2009-01-06
A copper(I)-catalyzed procedure for the synthesis of benzo[b]heterocycles. This protocol can be used to synthesize a variety of 2-arylbenzo[b]furans and indoles in good to excellent yields. This method can tolerate a variety of functional groups, does not require the use of expensive additives and is palladium-free.