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
作者:Jeremy J. Clemens、Juliana L. Asgian、Brett B. Busch、Timothy Coon、Justin Ernst、Leonard Kaljevic、Paul J. Krenitsky、Timothy D. Neubert、Edwin J. Schweiger、Andreas Termin、Dean Stamos
DOI:10.1021/jo302443k
日期:2013.1.18
Efforts to substitute the cyclopropane ring in a series of aryl cyclopropylnitriles led to the discovery of an operationally simple one-pot method for Knoevenagel condensation and subsequent Corey-Chaykovsky cyclopropanation giving diastereomerically pure products as a racemic mixture of enantiomers. Method development and results for variably substituted aryl acetonitriles and aldehydes in the reaction are reported. A concise synthesis of (+/-)-bicifadine in two steps is provided to demonstrate the utility of the method.