Intramolecular Pd(II)-Catalyzed Aerobic Oxidative Amination of Alkenes: Synthesis of Six-Membered <i>N</i>-Heterocycles
作者:Zhan Lu、Shannon S. Stahl
DOI:10.1021/ol300030w
日期:2012.3.2
Use of a base-free Pd(DMSO)2(TFA)2 catalyst system enables the synthesis of six-membered nitrogen heterocycles via a Wacker-type aerobic oxidative cyclization of alkenes bearing tethered sulfonamides. Various heterocycles, including morpholines, piperidines, piperazines, and piperazinones, are accessible by this method.
Enantioselective Aza-Wacker-Type Cyclization Promoted by Pd-SPRIX Catalyst
作者:Abhijit Sen、Kazuhiro Takenaka、Hiroaki Sasai
DOI:10.1021/acs.orglett.8b02946
日期:2018.11.2
An enantioselective aza-Wacker-type reaction was developed. When alkenyl sulfonamide substrates were treated with the Pd-SPRIX catalyst in the presence of oxone as an oxidant, the olefin was attacked intramolecularly by the nitrogen nucleophile to construct several heterocycles such as morpholines, piperazines, piperidines, and their benzo-fused derivatives in up to 88% yield with up to 80% ee.
Pd-Catalyzed Regioselective Intramolecular Allylic C–H Amination of 1,1-Disubstituted Alkenyl Amines
作者:Young Ho Kim、Dong Bin Kim、Su San Jang、So Won Youn
DOI:10.1021/acs.joc.2c00781
日期:2022.6.3
Pd-Catalyzed intramolecular allylic C–H amination of 1,1-disubstituted alkenyl amines with various allylic tethers (X = O, NMs, CH2) was developed. This process allows for the divergent synthesis of 1,3-X,N-heterocycles through a regioselective allylic C–H cleavage and π-allylpalladium formation. Particularly noteworthy is the use of substrates containing a labile allylic moiety and new simple catalytic