Starting from diverse alkene-tethered aryl iodides and O-benzoyl-hydroxylamines, the enantioselective reductive cross-electrophilic 1,2-carboamination of unactivatedalkenes was achieved using a chiral pyrox/nickel complex as the catalyst. This mild, modular, and practical protocol provides rapid access to a variety of β-chiral amines with an enantioenriched aryl-substituted quaternary carbon center
Preparation of 2,2′-bithiophene derivatives bearing ω-alkenyl groups at the 3,3′-positions and ring-closing metathesis reactions of the obtained compound were performed. The reaction of bithiophene bearing 3-butenyl substituents 1 with 5 mol % Grubbs 1st generation catalyst underwent ring-closing metathesis (RCM) to afford the cyclized product 7 showing winding vine-shaped molecular asymmetry in up
aldehydes and α-trifluoromethyl alkenes, which provides novel and efficientaccess to diverse gem-difluorohomoallylic alcohols. Remarkably, the high chemoselectivity of this reaction enables the conversion of the formyl moiety in the presence of various easily reducible functionalities including ketone, organohalides, aziridine, sulfone, alkyne, and unactivated alkene. The utility of this method is demonstrated
Nickel-Catalyzed Hydrofluorination of Unactivated Alkenes through a HAT Pathway
作者:Peihong Song、Shaolin Zhu
DOI:10.1021/acscatal.0c03884
日期:2020.11.20
We report the hydrofluorination of unactivated alkenes using N-fluorobenzenesulfonimide as a fluorination reagent. The reaction produces exclusively Markovnikov hydrofluorination products under mild conditions. It is not affected by air or moisture and uses an inexpensive and readily available nickel compound as a catalyst. Distinct from the previously reported ionic pathway of the NiH-catalyzed h
Iridium(I)-Catalyzed Intramolecular Hydrocarbonation of Alkenes: Efficient Access to Cyclic Systems Bearing Quaternary Stereocenters
作者:David F. Fernández、Moisés Gulías、José L. Mascareñas、Fernando López
DOI:10.1002/anie.201705105
日期:2017.8.1
wide variety of cyclic systems featuring methyl-substituted quaternary stereocenters is described. The method relies on the use of a cationic IrI–bisphosphine catalyst, which promotes a carboxamide-assisted activation of an olefinic C(sp2)−H bond followed by exo-cyclization to a tethered 1,1-disubstituted alkene. The extension of the method to aromatic and heteroaromatic C−H bonds, as well as developments