Regioselective Nickel-Catalyzed Reductive Couplings of Enones and Allenes
作者:Wei Li、Nan Chen、John Montgomery
DOI:10.1002/anie.201004740
日期:2010.11.8
Alkenes made easy: In a complement to coupling processes of terminal alkynes, the reductivecoupling of enones and allenes provides access to conjugate addition products that possess a 1,1‐disubstituted alkene (see scheme; cod=1,5‐cyclooctadiene). The solvent composition and reducing agent must be carefully matched to allow high levels of regioselectivity to be observed.
NHC–Cu-Catalyzed Protoboration of Monosubstituted Allenes. Ligand-Controlled Site Selectivity, Application to Synthesis and Mechanism
作者:Fanke Meng、Byunghyuck Jung、Fredrik Haeffner、Amir H. Hoveyda
DOI:10.1021/ol4004178
日期:2013.3.15
Two types of NHC-Cu complexes catalyze protoborations of terminal allenes to afford valuable 1,1- or trisubstituted vinylboron species with high site selectivity and stereoselectivity. The scope of the method, application to natural product synthesis, and mechanistic basis for the observed selectivity trends are presented.