Fe(III) Halides as Effective Catalysts in Carbon−Carbon Bond Formation: Synthesis of 1,5-Dihalo-1,4-dienes, α,β-Unsaturated Ketones, and Cyclic Ethers
作者:Pedro O. Miranda、David D. Díaz、Juan I. Padrón、Miguel A. Ramírez、Víctor S. Martín
DOI:10.1021/jo048410j
日期:2005.1.1
homopropargylic alcohols were used, a Prins-typecyclization occurred yielding 2-alkyl-4-halo-5,6-dihydro-2H-pyrans. In addition, anhydrous ferric halides are also shown to be excellent catalysts for the standard Prins cyclization with homoallylic alcohols. Isolation of an intermediate acetal, calculations, and alkyne hydration studies provide substantiation of a proposed mechanism.
β′-Hydroxy-α,β-unsaturated ketones: A new pharmacophore for the design of anticancer drugs
作者:José M. Padrón、Pedro O. Miranda、Juan I. Padrón、Víctor S. Martín
DOI:10.1016/j.bmcl.2006.01.023
日期:2006.4
A series of beta'-hydroxy-alpha,beta-unsaturated ketones were prepared by means of an iron(III) catalyzed domino process. The in vitro antiproliferative activities were examined in the human solid tumor cell lines A2780, SW1573, and WiDr. The results showed that beta'-hydroxy-alpha,beta-unsaturated ketones were more potent than alpha,beta-unsaturated ketones. The best activity profiles were obtained for the derivatives bearing cyclic or branched substituents on the side chains. (C) 2006 Elsevier Ltd. All rights reserved.
Alkyne Difunctionalization by Dual Gold/Photoredox Catalysis
作者:Adrian Tlahuext-Aca、Matthew N. Hopkinson、R. Aleyda Garza-Sanchez、Frank Glorius
DOI:10.1002/chem.201600710
日期:2016.4.18
Highly selective tandem nucleophilic addition/cross‐coupling reactions of alkynes have been developed usingvisible‐light‐promoted dual gold/photoredoxcatalysis. The simultaneous oxidation of AuI and coordination of the coupling partner by photo‐generated aryl radicals, and the use of catalytically inactive gold precatalysts allows for high levels of selectivity for the cross‐coupled products without