protocol for the reductive functionalization of amides into N‐sulfonylformamidines is reported. The one‐pot procedure is based on a mild catalyticreduction of tertiary amides into the corresponding enamines by the use of Mo(CO)6 (molybdenum hexacarbonyl) and TMDS (1,1,3,3‐tetramethyldisiloxane). The formed enamines were allowed to react with sulfonyl azides to give the target compounds in moderate to
Herein, we report a metal-free synthesis of cyclic amidines, oxazines, and an oxazinone under mild conditions by electrophilic amide activation. This strategy features an unusual Umpolung cyclization mode and enables the smooth union of α-aryl amides and diverse alkylazides, effectively rerouting our previously reported α-amination transform.
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.
The C–H alkylation of arylacetamides with activated alkenes such as substituted acrylates and vinylsulphone in the presence of a ruthenium catalyst and organic acid via the weak O-coordination under the redox free version is described. The present protocol was effective with different substituted arylacetamides including secondary and tertiary amides. The reaction mechanism including the ortho C–H