De Novo Synthesis of Troc-Protected Amines: Intermolecular Rhodium-Catalyzed C−H Amination with <i>N</i>-Tosyloxycarbamates
作者:Hélène Lebel、Kim Huard
DOI:10.1021/ol062953t
日期:2007.2.1
intermolecular C-Hinsertion of the nitrene derived from 2,2,2-trichloroethyl-N-tosyloxycarbamate proceeded in good to excellent yields to produce a variety of Troc-protected amines. With cyclic aliphatic alkanes, it is possible to use only 2 equiv of substrate, whereas the reaction with aromatic alkanes is run neat. Not only does the nitrene insertion proceed in benzylic, secondary, and tertiary C-H bonds
Organocatalyzed Aziridination of α-Branched Enals: Enantioselective Synthesis of Aziridines with a Quaternary Stereocenter
作者:Alaric Desmarchelier、Danilo Pereira de Sant'Ana、Vincent Terrasson、Jean Marc Campagne、Xavier Moreau、Christine Greck、Renata Marcia de Figueiredo
DOI:10.1002/ejoc.201100437
日期:2011.7
α-substituted-α,β-unsaturated aldehydes is described. The products were obtained in good yields (up to 86 %) and enantioselectivities (up to 90 % ee) and could rapidly be transformed under various conditions, including ring opening, to afford useful small molecules possessing not only the aziridine and aldehyde moieties but also other functionalities such as alcohol, acid, ester, or amino alcohol.
A Simple and Broadly Applicable C−N Bond Forming Dearomatization Protocol Enabled by Bifunctional Amino Reagents
作者:Xiaofeng Ma、Joshua J. Farndon、Tom A. Young、Natalie Fey、John F. Bower
DOI:10.1002/anie.201708176
日期:2017.11.13
A C-Nbondformingdearomatizationprotocol with broad scope is outlined. Specifically, bifunctionalaminoreagents are used for sequential nucleophilic and electrophilic C-Nbond formations, with the latter effecting the key dearomatization step. Using this approach, γ-arylated alcohols are converted to a wide range of differentially protected spirocyclic pyrrolidines in just two or three steps.