Mechanistic Pathways in Amide Activation: Flexible Synthesis of Oxazoles and Imidazoles
作者:Giovanni Di Mauro、Boris Maryasin、Daniel Kaiser、Saad Shaaban、Leticia González、Nuno Maulide
DOI:10.1021/acs.orglett.7b01678
日期:2017.7.21
α-aminoamides through triflic anhydride-mediated amide activation is reported. These reactions proceed via the intermediacy of nitrilium adducts and feature N-oxide-promoted umpolung of the α-position of amides as well as a mechanistically intriguing sequence that results in sulfonyl migration from nitrogen to carbon. Quantum-chemical mechanistic analysis sheds light on the intricacies of the process
Metal-Free Formal Oxidative C−C Coupling by In Situ Generation of an Enolonium Species
作者:Daniel Kaiser、Aurélien de la Torre、Saad Shaaban、Nuno Maulide
DOI:10.1002/anie.201701538
日期:2017.5.15
contemporary organic synthesis relies on transformations that are driven by the intrinsic, so‐called “natural”, polarity of chemical bonds and reactive centers. The design of unconventionally polarized synthons is a highly desirable strategy, as it generally enables unprecedented retrosynthetic disconnections for the synthesis of complex substances. Whereas the umpolung of carbonyl centers is a well‐known