Gold- and Silver-Catalyzed Reactions of Propargylic Alcohols in the Presence of Protic Additives
作者:Matthew N. Pennell、Peter G. Turner、Tom D. Sheppard
DOI:10.1002/chem.201102830
日期:2012.4.10
secondary and tertiary propargylicalcohols undergo a Meyer–Schusterrearrangement to give enones at room temperature in the presence of a gold(I) catalyst and small quantities of MeOH or 4‐methoxyphenylboronic acid. The syntheses of the enone natural products isoegomaketone and daphenone were achieved using this reaction as the key step. The rearrangement of primary propargylicalcohols can readily be combined
A General Procedure for the Synthesis of Enones via Gold-Catalyzed Meyer−Schuster Rearrangement of Propargylic Alcohols at Room Temperature
作者:Matthew N. Pennell、Matthew G. Unthank、Peter Turner、Tom D. Sheppard
DOI:10.1021/jo102263t
日期:2011.3.4
Meyer−Schuster rearrangements of propargylic alcohols take place readily at room temperature in toluene with 1−2 mol % PPh3AuNTf2, in the presence of 0.2 equiv of 4-methoxyphenylboronic acid or 1 equiv of methanol. Good to excellent yields of enones can be obtained fromsecondary and tertiary alcohols, with high selectivity for the E-alkene in most cases. A one-pot procedure for the conversion of primary
α,β-Unsaturatedketones were synthesized by one-pot procedure from various ketones in good to excellent yields on treatment of their lithium enolates with N-tert-butyl phenylsulfinimidoyl chloride (1) under mild conditions.
A convenient synthesis of 4-alkyl-3-benzoylpyrroles from α,β-unsaturated ketones and tosylmethyl isocyanide
作者:Kapil Kumar、Shital S. More、Sandeep Goyal、Mukesh Gangar、Gopal L. Khatik、Ravindra K. Rawal、Vipin A. Nair
DOI:10.1016/j.tetlet.2016.04.056
日期:2016.5
A convenient synthesis of 4-alkyl-3-benzoyl pyrrole was achieved fromα,β-unsaturated ketones and tosylmethyl isocyanide in the presence of mild base LiOH·H2O. This method is very economical and was successfully utilized for the synthesis of various 4-alkyl-3-benzoylpyrrole derivatives with good to excellent yields.
Copper-Catalyzed Aza-Michael Addition of 2-Aminobenzoate to β-Substituted α,β-Unsaturated Ketones: One-Pot Synthesis of 3-Carbonyl-2-Substituted Quinolin-4(1<i>H</i>)-ones
作者:Seongil Kang、Subin Park、Kyung-su Kim、Changsik Song、Yunmi Lee
DOI:10.1021/acs.joc.7b03162
日期:2018.3.2
We present a new and straightforward one-pot process for the synthesis of 3-carbonyl-4-quinolone derivatives through highly efficient Cu-catalyzed aza-Michael addition of 2-aminobenzoates to β-substituted α,β-unsaturatedketones/cyclization/mild oxidation reactions. A broad range of new versatile 3-carbonyl-quinolin-4(1H)-ones is prepared from readily available chemicals under mild reaction conditions