Diazo Reagents in Copper(I)-Catalyzed Olefination of Aldehydes
作者:Hélène Lebel、Michaël Davi
DOI:10.1002/adsc.200800381
日期:2008.10.6
The olefination of aldehydes to synthesize unsaturated ketones, esters, amides and phosphonates using diazo reagents and triphenylphosphine in the presence of copper(I) iodide as catalyst, is described. Good to excellent E:Z selectivities as well as yields were obtained for a large variety of aliphatic, aromatic and heteroaromatic aldehydes. The reaction showed also an excellent functional group compatibility
Large‐Scale Synthesis of a Niche Olefin Metathesis Catalyst Bearing an Unsymmetrical N‐Heterocyclic Carbene (NHC) Ligand and its Application in a Green Pharmaceutical Context
large‐scale synthesis of known Ru olefinmetathesis catalyst VII featuring an unsymmetrical N‐heterocyclic carbene (NHC) ligand with one 2,5‐diisopropylphenyl (DIPP) and one thiophenylmethylene N‐substituent is reported. The optimised procedure does not require column chromatography in any step and allows for preparation of up to 0.5 kg batches of the catalyst from simple precursors. The application profile
Asymmetric total synthesis of the myxobacteria metabolites crocacins A–D
作者:John T. Feutrill、Michael J. Lilly、Jonathan M. White、Mark A. Rizzacasa
DOI:10.1016/j.tet.2008.01.139
日期:2008.5
The total syntheses of crocacins A-D are described. The key steps were a syn-aldol reaction followed by anti-reduction to secure the stereo-tetrad and acylation of an ene- or dienecarbamate to form the enamide. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.