Pseudoephedrine as a Chiral Auxiliary for Asymmetric Michael Reactions: Synthesis of 3-Aryl-δ-lactones
作者:Jacqueline H. Smitrovich、Geneviève N. Boice、Chuanxing Qu、Lisa DiMichele、Todd D. Nelson、Mark A. Huffman、Jerry Murry、James McNamara、Paul J. Reider
DOI:10.1021/ol0259847
日期:2002.5.1
[reaction: see text] The asymmetric Michael reaction of pseudoephedrine amides is reported. The 1,5-dicarbonyl products are converted to 3-aryl-delta-lactones in a two-step reduction/lactonization sequence. This method provides access to enantiomerically enriched trans-3,4-disubstituted delta-lactones.
A versatile and site-selective rhodium(III)-catalyzed aerobic oxidativealkenylation of arylacetamides including primary, secondary, and tertiary amides having a weak O-coordinating acetamide directing group with alkenes is described. In the reaction, air was utilized as a sole oxidant. The reaction was compatible with activated alkenes and maleimides.
Rhodium(III)-Catalyzed Redox-Neutral Weak <i>O</i>-Coordinating Vinylation and Allylation of Arylacetamides with Allylic Acetates
作者:Subramanian Jambu、Masilamani Jeganmohan
DOI:10.1021/acs.orglett.9b01995
日期:2019.7.19
efficient Rh(III)-catalyzed redox-neutral weak O-coordinating vinylation and allylation of arylacetamides with allylic acetates are described. A wide variety of arylacetamides containing primary, secondary, and tertiary amides and substituted allylic acetates was compatible for the reaction. The synthesized ortho-vinylated arylacetamides were converted into ortho-vinylated phenyl aceticacid and biologically
Synthesis of 11C-amides using [11C]carbon monoxide and in situ activated amines by palladium-mediated carboxaminations
作者:Farhad Karimi、Bengt Långström
DOI:10.1039/b209553j
日期:2003.1.30
were used in the palladium-mediatedsynthesis of twenty 11C-amides. In the study several approaches to improve the radiochemical yield were explored. Eight of the selected amides were prepared by in situ activation of the amines usinglithium bis(trimethylsilyl)amide and the radiochemical yields of these reactions were improved compared to utilising a previous reported method. In the synthesis of 1
Michael Reactions of Pseudoephedrine Amide Enolates: Effect of LiCl on Syn/Anti Selectivity
作者:Jacqueline H. Smitrovich、Lisa DiMichele、Chuanxing Qu、Geneviève N. Boice、Todd D. Nelson、Mark A. Huffman、Jerry Murry
DOI:10.1021/jo035564a
日期:2004.3.1
asymmetric Michael reaction of pseudoephedrine amide enolates changes dramatically in the presence of LiCl. Reaction of the enolate in the absence of LiCl results in formation of the antiMichael adduct with high selectivity, whereas in the presence of lithium chloride the syn adduct is favored. This method provides access to enantiomerically enriched trans-3,4-disubstituted δ-lactones from the anti Michael