Carbonyl Imines from Oxaziridines: Generation and Cycloaddition of NOC Dipoles
作者:Katherine M. Partridge、Ilia A. Guzei、Tehshik P. Yoon
DOI:10.1002/anie.200905801
日期:2010.1.25
Dipoles apart: Unusual 1,3‐dipolar carbonylimines are generated in the presence of a bulky scandium(III) catalyst by undergoing a Lewis acid catalyzed rearrangement of N‐sulfonyl oxaziridines. The 1,3‐dipolar carbonylimines then undergo subsequent cycloaddition with a variety of dipolarophiles. tmbox=2,2′‐isopropylidenebis(4,4‐dimethyl‐2‐oxazoline).
PhI(OAc)2/KI-Mediated Reaction of Aryl Sulfinates with Alkenes, Alkynes, and α,β-Unsaturated Carbonyl Compounds: Synthesis of Vinyl Sulfones and β-Iodovinyl Sulfones
(Diacetoxyiodo)benzene [PhI(OAc) 2 , DIB] was able to promote the reaction of sodium aryl sulfinate and potassium iodide (KI) with alkenes and alkynes to afford the corresponding vinyl sulfones and β-iodovinyl sulfones, respectively, in good yields. The salient features of this reaction are that it employs a commercially available and environmentally benign hypervalent iodine(III) reagent, a one-step
considerable progress has been made in the asymmetric synthesis of trans- and trisubstituted glycidic esters, achieving enantioselective preparation of cis-glycidic esters has remained a long-standing challenge. Here, we demonstrate a selectivity-predictable modular platform for the asymmetric synthesis of cis-glycidic esters via a novel dinuclear (salen)titanium(III)-catalyzed radical-type kinetic resolution
Catalytic hydrofluorination of olefins using a cobalt catalyst was developed. The exclusive Markovnikov selectivity, functional group tolerance, and scalability of this reaction make it an attractive protocol for the hydrofluorination of olefins. A preliminary mechanistic experiment showed the involvement of a radical intermediate.
Synergistic Hydrocobaltation and Borylcobaltation Enable Regioselective Migratory Triborylation of Unactivated Alkenes
作者:Yinsong Zhao、Shaozhong Ge
DOI:10.1002/anie.202116133
日期:2022.3.28
A regioselective cobalt-catalyzed triborylation of unactivatedalkenes is developed to access synthetically versatile 1,1,3-triborylalkanes with a catalyst generated from Co(acac)2 and xantphos. Mechanistic studies reveal that this triborylation reaction proceeds through three interdependent catalytic cycles.