Iodine(V) Reagents in Organic Synthesis. Part 3. New Routes to Heterocyclic Compounds via <i>o</i>-Iodoxybenzoic Acid-Mediated Cyclizations: Generality, Scope, and Mechanism
作者:K. C. Nicolaou、P. S. Baran、Y.-L. Zhong、S. Barluenga、K. W. Hunt、R. Kranich、J. A. Vega
DOI:10.1021/ja012126h
日期:2002.3.1
The discovery and development of the o-iodoxybenzoic acid (IBX) reaction with certain unsaturated N-aryl amides (anilides) to form heterocycles are described. The application of the method to the synthesis of delta-lactams, cyclic urethanes, hydroxy amines, and amino sugars among other important building blocks and intermediates is detailed. In addition to the generality and scope of this cyclization
A Unified and Practical Method for Carbon–Heteroatom Cross‐Coupling using Nickel/Photo Dual Catalysis
作者:Randolph A. Escobar、Jeffrey W. Johannes
DOI:10.1002/chem.202000052
日期:2020.4.21
While carbon-heteroatom cross-couplingreactions have been extensively studied, many methods are specific and limited to a particular set of substrates or functional groups. Reported here is a general method that allows for C-O, C-N and C-Scross-couplingreactions under one general set of conditions. We propose that an energy transfer pathway, in which an iridium photosensitizer produces an excited
Silver-catalyzed cascade cyclization and functionalization of <i>N</i>-aryl-4-pentenamides: an efficient route to γ-lactam-substituted quinone derivatives
作者:Zeguo Fang、Lin Xie、Liang Wang、Qian Zhang、Dong Li
DOI:10.1039/d2ra05283k
日期:——
synthesis of γ-lactam-substituted quinone derivativesthrough a Ag2O-catalyzed cascade cyclization and functionalization of N-aryl-4-pentenamides has been developed. Related 2-oxazolidinone substituted quinone products can be also obtained with N-aryl allyl carbamates. The reactions proceed through an amidyl radical-initiated 5-exo-trig cyclization and followed radical addition to quinones. They provide an
Formation of Ketenimines via the Palladium-Catalyzed Decarboxylative π-Allylic Rearrangement of <i>N</i>-Alloc Ynamides
作者:Juliana R. Alexander、Matthew J. Cook
DOI:10.1021/acs.orglett.7b02780
日期:2017.11.3
A new approach for the formation of ketenimines via a decarboxylative allylic rearrangement pathway that does not require strong stabilizing or protecting groups has been developed. The products can be readily hydrolyzed into their corresponding secondary amides or reacted with sulfur ylides to perform an additional [2,3]-Wittig process. Mechanistic studies suggest an outer-sphere process in which