A regiospecific allyl–allylcoupling reaction between 1,3-dienes and allylboronates has been demonstrated under nickel catalysis. Salient features of this method include the earth-abundant metal catalyst, excellent regioselectivity and good functional group tolerance. Notably, even congested allyl substrates can also be applied to this protocol, thus allowing for the rapid preparation of a series of
Hendrickson Reagent Induced Rearrangement of Aryl Propargyl Alcohols To α,β-Unsaturated Aldehydes
作者:Ziad Moussa、Ateyatallah Aljuhani
DOI:10.2174/1570178615666180329154246
日期:2018.8.8
solution (2 mL), followed by the addition of water and Et3N (2.0 mmol) and further stirring at room temperature for 1h. Subsequent workup with 5% NaHCO3 (20 mL) and purification afforded α,β- unsaturated aldehydes. Eighteen aryl propargyl alcohol substrates with a terminal α-acetylenic group were transformed in good to excellent yields (71-85%) to enals. The methodology proved successful with secondary
A metal-free and two-phase protocol for the Meyer-Schuster isomerization of propargyl alcohols to the corresponding α,β-unsaturatedcarbonylcompounds has been achieved in the presence of stoichiometric phosphorous acid aqueous solution, which produces the desired products in high yields with excellent stereoselectivity. Compared with the traditional methods, the procedure features broad scope of the
Enantioselective Michael Addition to α,β-Unsaturated Aldehydes: Combinatorial Catalyst Preparation and Screening, Reaction Optimization, and Mechanistic Studies
作者:Ivana Fleischer、Andreas Pfaltz
DOI:10.1002/chem.200902449
日期:2010.1.4
Shortcut to chiral catalysts: An efficient combinatorial strategy based on back reaction screening by ESI‐MS allows rapid evaluation of organocatalysts for the asymmetric Michael addition to α,β‐unsaturated aldehydes (see scheme). An unexpected nonlinear effect has been observed in this reaction, resulting from a double nucleophilic–electrophilic activation mechanism involving two catalyst molecules
Iron(III) Chloride–Promoted Isomerization of Propargyl Alcohols to α,β-Unsaturated Carbonyl Compounds
作者:Ahmad Samih El Douhaibi、Zaher M. A. Judeh、Hedaya Basri、Ziad Moussa、Mouslim Messali、Gao Qi
DOI:10.1080/00397911003611810
日期:2011.1.31
Abstract Aryl propargylalcohols bearing a terminal alkynyl moiety can undergo a facile iron(III) chloride–promoted transformation to the corresponding α,β-unsaturated aldehyde in good yield and excellent stereoselectivity.