β‐Diazocarbonyl Compounds: Synthesis and their Rh(II)‐Catalyzed 1,3 C−H Insertions
作者:Liyin Jiang、Zhaofeng Wang、Melanie Armstrong、Marcos G. Suero
DOI:10.1002/anie.202015077
日期:2021.3.8
of ketone silyl enol ethers with diazomethyl‐substituted hypervalent iodine reagents that gives access to unusual β‐diazocarbonyl compounds. The potential of this unexplored class of diazo compounds for the development of new reactions was demonstrated by the discovery of a rare Rh‐catalyzed intramolecular 1,3 C−H carbene insertion that led to complex cyclopropanes with excellent stereocontrol.
Rh(III)-Catalyzed Cyclopropanation Initiated by C–H Activation: Ligand Development Enables a Diastereoselective [2 + 1] Annulation of N-Enoxyphthalimides and Alkenes
作者:Tiffany Piou、Tomislav Rovis
DOI:10.1021/ja506579t
日期:2014.8.13
N-Enoxyphthalimides undergo a Rh(III)-catalyzedC–Hactivationinitiatedcyclopropanation of electron deficient alkenes. The reaction is proposed to proceed via a directed activation of the olefinic C–H bond followed by two migratory insertions, first across the electron-deficient alkene and then by cyclization back onto the enol moiety. A newly designed isopropylcyclopentadienyl ligand drastically
Stereodivergent Rhodium(III)-Catalyzed cis-Cyclopropanation Enabled by Multivariate Optimization
作者:Tiffany Piou、Fedor Romanov-Michailidis、Melissa A. Ashley、Maria Romanova-Michaelides、Tomislav Rovis
DOI:10.1021/jacs.8b04243
日期:2018.8.1
organic approach to invert the sense of induction in diastereoselective cyclopropanation of alkenes with N-enoxyphthalimides through rhodium(III) catalysis. Careful parametrization of catalyst-substrate molecular determinants allowed us to interrogate linear-free energy relationships and establish an intuitive and robust statistical model that correlates an extensive number of data points in high accuracy
Chiral cyclopentadienyl Rh<sup>III</sup>-catalyzed enantioselective cyclopropanation of electron-deficient olefins enable rapid access to UPF-648 and oxylipin natural products
作者:Coralie Duchemin、Nicolai Cramer
DOI:10.1039/c8sc05702h
日期:——
Chiral cyclopentadienyl RhIII complexes efficientlycatalyze enantioselective cyclopropanations of electron-deficient olefins with N-enoxysuccinimides as the C1 unit. Excellent asymmetric inductions and high diastereoselectivities can be obtained for a wide range of substrate combinations. The reaction proceeds undermildconditions without precautions to exclude air and water. Moreover, the synthetic
Cyclopropanation of .alpha.,.beta.-unsaturated carbonyl compounds and nitriles with diazo compounds. The nature of the involvement of transition-metal promoters
作者:Michael P. Doyle、Robert L. Dorow、William H. Tamblyn