Design and Synthesis of Novel Chiral Dirhodium(II) Carboxylate Complexes for Asymmetric Cyclopropanation Reactions
作者:Frady G. Adly、Michael G. Gardiner、Ashraf Ghanem
DOI:10.1002/chem.201504817
日期:2016.3.1
the design of dirhodium(II) tetracarboxylates derived from (S)‐amino acid ligands is reported. The approach is founded on tailoring the steric influences of the overall catalyst structure by reducing the local symmetry of the ligand's N‐heterocyclic tether. The application of the new approach has led to the uncovering of [Rh2(S‐tertPTTL)4] as a new member of the dirhodium(II) family with extraordinary
Stereoselective construction of nitrile-substituted cyclopropanes
作者:Justin R. Denton、Kevin Cheng、Huw M. L. Davies
DOI:10.1039/b719175h
日期:——
Nitrile-substituted cyclopropanes are readily synthesized in a stereocontrolled fashion from the intermolecular cyclopropanation between 2-diazo-2-phenylacetonitrile and electron-rich olefins, catalyzed by the chiral dirhodium complex, Rh2(S-PTAD)4.
Reactions of Hypervalent Iodonium Alkynyl Triflates with Azides: Generation of Cyanocarbenes
作者:I. F. Dempsey Hyatt、Mitchell P. Croatt
DOI:10.1002/anie.201203062
日期:2012.7.23
time: Cyanocarbenes have been formed by the reaction of azides with hypervalentiodoniumalkynyltriflates (HIATs). Experimental evidence supports the potential intermediacy of an azide‐substituted vinylidene or alkynylazide, both of which could form a cyanocarbene. Trapping of the vinylidene and cyanocarbene includes OH insertion, dimethyl sulfoxide coordination, and cyclopropanation reactions.