Diverse<i>N</i>-Heterocyclic Ring Systems via Aza-Heck Cyclizations of<i>N</i>-(Pentafluorobenzoyloxy)sulfonamides
作者:Ian R. Hazelden、Xiaofeng Ma、Thomas Langer、John F. Bower
DOI:10.1002/anie.201605152
日期:2016.9.5
bond of N‐(pentafluoro‐benzoyloxy)sulfonamides are described. These studies, which encompass only the second class of aza‐Heck reaction developed to date, provide direct access to diverse N‐heterocyclicringsystems.
Pyrrolidines and Piperidines by Ligand-Enabled Aza-Heck Cyclizations and Cascades of <i>N</i>
-(Pentafluorobenzoyloxy)carbamates
作者:Ian R. Hazelden、Rafaela C. Carmona、Thomas Langer、Paul G. Pringle、John F. Bower
DOI:10.1002/anie.201801109
日期:2018.4.23
Ligand‐enabled aza‐Heck cyclizations and cascades of N‐(pentafluorobenzoyloxy)carbamates are described. These studies encompass the first examples of efficient non‐biased 6‐exo aza‐Heck cyclizations. The methodology provides direct and flexible access to carbamate protected pyrrolidines and piperidines.
Stereospecific Alkene Aziridination Using a Bifunctional Amino-Reagent: An Aza-Prilezhaev Reaction
作者:Joshua J. Farndon、Tom A. Young、John F. Bower
DOI:10.1021/jacs.8b10485
日期:2018.12.26
deprotection (TFA) of O-Ts activated N-Boc hydroxylamines triggers intramolecular aziridination of N-tethered alkenes to provide complex N-heterocyclic ring systems. Synthetic and computational studies corroborate a diastereospecific aza-Prilezhaev-type mechanism. The feasibility of related intermolecular alkene aziridinations is also demonstrated.
A practical palladium and amino acid co-catalyzed hydroarylation of unbiased alkenes has been developed. Using the transient-directing strategy, this chemistry could construct isolated chiral Csp2–Csp3 bonds with good regio- and enantioselectivity. The potential synthetic utility of a representative product was well-illustrated by further transformations. Furthermore, the mechanism of this reaction
Ligand‐Dictated Regiodivergent Allylic Functionalizations via Palladium‐Catalyzed Remote Substitution
作者:Xin Wang、Han-Zhe Miao、Guo-Qiang Lin、Zhi-Tao He
DOI:10.1002/anie.202301556
日期:——
Palladium-catalyzed regiodivergent allylic C−H functionalizations were established via remote substitution, which provides a novel model for the seldomly studied migratory Tsuji–Trost reaction. 1,4-Hydrofunctionalization of a conjugated diene intermediate was demonstrated to be feasible via a newly synthesized bisphosphine ligand.