Bidentate carbenoid ester coordination in ruthenium(ii) Schiff-base complexes leading to excellent levels of diastereo- and enantioselectivity in catalytic alkene cyclopropanation
作者:Ian J. Munslow、Kevin M. Gillespie、Robert J. Deeth、Peter Scott
DOI:10.1039/b104964j
日期:——
Exceptionally high stereoselectivity (ee ⩽ 98%, dr ⩽
99∶1) in the cyclopropanation of alkenes with ethyl diazoacetate
using a non-planar ruthenium(II) Schiff-base precatalyst is a
result of η2C,O binding of the carbenoid ester
intermediate, according to DFT calculations.
Stereodivergent Intramolecular Cyclopropanation Enabled by Engineered Carbene Transferases
作者:Ajay L. Chandgude、Xinkun Ren、Rudi Fasan
DOI:10.1021/jacs.9b02700
日期:2019.6.12
myoglobin biocatalysts for executing asymmetric intramolecular cyclopropanations resulting in cyclopropane-fused γ-lactones, which are key motifs found in many bioactive molecules. Using this strategy, a broad range of allyl diazoacetate substrates were efficiently cyclized in high yields with up to 99% enantiomeric excess. Upon remodeling of the active site via protein engineering, myoglobin variants
Comparative evaluation of enantiocontrol for intramolecular cyclopropanation of diazoacetates with chiral CuI, RhII and RuII catalysts
作者:Michael P. Doyle、Chad S. Peterson、Qi-Lin Zhou、Hisao Nishiyama
DOI:10.1039/a606893f
日期:——
Enantioselectivity for intramolecular cyclopropanation of allylic
diazoacetates shows complementarity in comparisons of chiral
Cu
I
, Rh
II
and Ru
II
catalysts.
在手性 Cu I、Rh II 和 Ru II 催化剂的比较中,烯丙基重氮乙酸酯分子内环丙烷化的对映选择性显示出互补性。
Enhancement of enantiocontrol/diastereocontrol in catalytic intramolecular cyclopropanation and carbon-hydrogen insertion reactions of diazoacetates with Rh2(4S-MPPIM)4
作者:Michael P. Doyle、Qi-Lin Zhou、Alexey B. Dyatkin、Daniel A. Ruppar
DOI:10.1016/0040-4039(95)01561-u
日期:1995.10
Dirhodium(II) tetrakis[methyl 1-(3-phenylpropanoyl)imidazolidin-2-one-4(S)-carboxylate], Rh-2(4S-MPPIM)(4), provides significant enhancement in enantiocontrol for intramolecular cyclopropanation reactions of allylic diazoacetates and optimal enantiocontrol/diastereocontrol for intramolecular C-H insertion reactions of secondary alkyl diazoacetates.
High enantioselectivity in the intramolecular cyclopropanation of allyl diazoacetates using a novel rhodium(II) catalyst
作者:Michael P. Doyle、Roland J. Pieters、Stephen F. Martin、Richard E. Austin、Christopher J. Oalmann、Paul Mueller