Rhodium(II) carboxylates are privileged catalysts for the most challenging carbene-, nitrene-, and oxo-transfer reactions. In this work, we address the strategic challenges of current organic and inorganic synthesis methods to access these rhodium(II) complexes through an oxidative rearrangement strategy and a reductive ligation reaction. These studies illustrate the multiple benefits of oxidative
Rhodium-Catalyzed Cyclopropenation of Alkynes: Synthesis of Trifluoromethyl-Substituted Cyclopropenes
作者:Bill Morandi、Erick M. Carreira
DOI:10.1002/anie.201000787
日期:——
Make it strained and fluorinated! A rhodium‐catalyzed domino diazotization/cyclopropenation reaction involving trifluoroethylamine hydrochloride and alkynes has been developed for the synthesis of trifluoromethyl cyclopropenes that can be easily functionalized to afford useful CF3‐containing building blocks for drug discovery.
Stereoselective Preparation of CF<sub>3</sub>-Containing Cyclopropanes
作者:Veronika Myronova、Dominique Cahard、Ilan Marek
DOI:10.1021/acs.orglett.2c03714
日期:2022.12.16
diastereoselective carbometalation of easily accessible CF3-substituted cyclopropenes is developed with a diastereoselectivity of the addition opposite to the CF3 group. This simple strategy allows the preparation of polysubstituted (up to penta-) cyclopropyl rings possessing two adjacent quaternary carbon stereocenters with excellent diastereoselectivities.
Stereoselective Nucleophilic Halogenation at CF<sub>3</sub>-Substituted Nonclassical Carbocation
作者:Veronika Myronova、Dominique Cahard、Ilan Marek
DOI:10.1021/acs.orglett.4c01161
日期:——
formation of a nonclassical cyclopropylcarbinyl cation intermediate, reacting at the most-substituted carbon center. Tertiary alkyl chlorides, bromides, and fluorides adjacent to a stereogenic C–CF3-motif are diastereomerically pure and can be obtained in few catalytic steps from commercially available alkynes.