Pd(II)/Bu4NBr/DMSO Catalytic System for Practical Synthesis of Indoles and Pyrroles from Imines through Aerobic Dehydrogenative Cyclization
作者:Naohiko Yoshikai、Wei Tan、Xiaoya Hou
DOI:10.1055/s-0034-1379208
日期:——
scales (up to 55 mmol). N-Aryl- and N-allylimines derived typically from substituted acetophenones undergo palladium(II)-catalyzeddehydrogenativecyclization reactions in the presence of tetrabutylammonium bromide and molecular oxygen in DMSO to afford indole and pyrrole derivatives, respectively, in moderate to good yields. The reactions are operationally simple and can be readily performed on multigram
Disulfonimide‐Catalyzed Asymmetric Reduction of
<i>N</i>
‐Alkyl Imines
作者:Vijay N. Wakchaure、Philip S. J. Kaib、Markus Leutzsch、Benjamin List
DOI:10.1002/anie.201504052
日期:2015.9.28
A chiral disulfonimide (DSI)‐catalyzedasymmetric reduction of N‐alkyl imines with Hantzsch esters as a hydrogen source in the presence of Boc2O has been developed. The reaction delivers Boc‐protectedN‐alkyl amines with excellent yields and enantioselectivity. The method tolerates a large variety of alkyl amines, thus illustrating potential for a general reductive cross‐coupling of ketones with diverse
An efficient, noble-metal-free formal [4+2] cycloaddition reaction between ketones and imines was developed for synthesizing poly-substituted pyridines, whereby two sequential C−C bonds are formed.
Photochemically Produced Aminocyclobutanes as Masked Dienes in Thermal Electrocyclic Cascade Reactions
作者:Luke D. Elliott、Kevin I. Booker-Milburn
DOI:10.1021/acs.orglett.9b00211
日期:2019.3.1
involving the in situ formation of a cyclobutene, followed by electrocyclic ring opening, Diels–Aldercycloaddition, and subsequent lactamization. This combination of excited state photochemistry and thermal electrocyclic cascade reactions allows simple planar molecules to be rapidly transformed into sp3-rich scaffolds.