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