Radicals from Aldehydes: A Convergent Access to Dienes and δ-Lactones
作者:Samir Zard、Sharanjeet Bagal、Lucie Tournier
DOI:10.1055/s-2006-941582
日期:2006.6
A convenient method for the generation of O,S-acetal xanthates from aldehydes has been developed. The corresponding nucleophilic radicals undergo facile addition to unactivated olefins and the resulting adducts can be further elaborated to generate dienes and unsaturated δ-lactones.
A Convergent, Unified Approach to Functionalized Fluoro- and Trifluoromethyl Alkenes
作者:Laurent Debien、Béatrice Quiclet-Sire、Samir S. Zard
DOI:10.1021/ol3023903
日期:2012.10.5
A modular, convergent, and operationally simple route to trifluoromethyl alkenes and vinyl fluorides involving a unique carbon–oxygen bond homolysis is reported. Highly functionalized trifluoromethyl alkenes and vinyl fluorides were obtained in good yields and good selectivity.
Synthesis of pyrazolylvinyl ketones from furan derivatives
作者:Nattawut Sawengngen、Petrakis N. Chalikidi、Sara Araby、Frank Hampel、Peter Gmeiner、Olga V. Serdyuk
DOI:10.1039/c9ob00701f
日期:——
A new protocol for the synthesis of pyrazol-5-ylvinyl ketones, e.g. pyrazole-chalcones, employing furfuryl ketones as a triketone equivalent, has been developed. The reaction occurs under mild conditions and does not require the use of expensive materials. Other important benefits include the simplicity and atom efficiency of this approach.
From a Remarkable Manifestation of Polar Effects in a Radical Fragmentation to the Convergent Synthesis of Highly Functionalized Ketones
作者:Laurent Debien、Samir Z. Zard
DOI:10.1021/ja400831w
日期:2013.3.13
A new radical addition/C-C bond fragmentation process is reported. Vinyl carbinols derived from 2-methyl-2-phenylpropanal react with radicals generated from xanthates to give the corresponding ketones. The radical cleavage reaction proceeds under mild conditions, in good to high yield, and in the presence of the unprotected carbinol. Highly functionalized 1,5-diketones and pyridines are readily available
xanthate-based radicaladdition/cyclization reaction cascade toward 2-biphenylisocyanides is described as a practical and modular approach to 6-alkylated phenanthridines. The use of xanthates as radical precursors allowed the synthesis of diversely 6-substituted phenanthridines. Electrophilicradicals derived from nitriles, aromatic and aliphatic ketones, malonates, and amide derivatives, as well as radicals