Transition-metal-promoted 6-endo-dig cyclization of aromatic enynes: rapid synthesis of functionalized naphthalenes
摘要:
Transition-metal-mediated cyclization of aromatic enynes provides high yields of substituted naphthalene compounds. The reaction can tolerate a wide range of substituents on both the olefin and the alkyne. The most useful catalysts were found to be [Rh(CO)(2)Cl](2), PdCl2 and PtCl2. In addition, a facile silyl migration occurs when the acetylene is substituted with a triorganosilyl group affording 4-silyl-naplithalenes. (C) 2001 Elsevier Science Ltd. All rights reserved.
intermolecular addition–intramolecular carbocyclization reaction of dialkynylbenzenes was developed. In this reaction, regioselective addition of an external nucleophile toward the terminal alkyne and subsequent 6-endo-dig cyclization proceeded to give the 1,3-disubstituted naphthalenes in good yields. The direct synthesis of disubstituted chrysenesvia a gold-catalyzed addition and double cyclization cascade
Silver(I) versus Gold(I) Catalysis
in Benzannulation Reaction: A Versatile Access to Acridines
作者:Philippe Belmont、Thomas Godet
DOI:10.1055/s-2008-1078178
日期:——
catalytic amounts of gold and/or silver salts, the reaction of silyl enol ethers onto alkynes occurs under mild conditions to produce the corresponding polycyclic aromatic systems (acridine, quinoline or naphthalene cores) in good to high yields. Among the catalysts investigated, AgOTf has been chosen as a general catalyst for this reaction which likely proceeds through silver(I) activation of the alkynyl