Cyclopropanation of Olefins with Diazo Compounds Catalyzed by a Dicopper-substituted Silicotungstate [γ-H<sub>2</sub>SiW<sub>10</sub>O<sub>36</sub>Cu<sub>2</sub>(μ-1,1-N<sub>3</sub>)<sub>2</sub>]<sup>4−</sup>
作者:Keigo Kamata、Toshihiro Kimura、Noritaka Mizuno
DOI:10.1246/cl.2010.702
日期:2010.7.5
silicotungstate (TBA) 4 -[γ-H 2 SiW 10 O 36 Cu II 2 (μ-1,1-N 3 ) 2 ] (I, TBA = tetra-n-butylammonium) could act as an efficient precatalyst for the chemoselective cylopropanation of olefins with diazo compounds. Various kinds of olefins were efficiently converted to the corresponding cyclopropane derivatives in good yields.
双铜取代的 γ-Keggin 硅钨酸盐 (TBA) 4 -[γ-H 2 SiW 10 O 36 Cu II 2 (μ-1,1-N 3 ) 2 ] (I, TBA = 四正丁基铵)作为烯烃与重氮化合物化学选择性环丙烷化的有效预催化剂。各种烯烃以良好的收率有效地转化为相应的环丙烷衍生物。
Synthesis of Metal–(Pentadentate-Salen) Complexes: Asymmetric Epoxidation with Aqueous Hydrogen Peroxide and Asymmetric Cyclopropanation (salenH2:N,N′-bis(salicylidene)ethylene-1,2-diamine)
作者:Hiroaki Shitama、Tsutomu Katsuki
DOI:10.1002/chem.200601420
日期:2007.6.4
manganese(III) and cobalt(II) complexes, in which the fifth ligand is expected to intramolecularly coordinate to the metal center and exert a trans effect. Indeed, high enantioselectivity has been achieved in epoxidations using aqueous hydrogen peroxide as the terminal oxidant and in cyclopropanations with these complexes as catalysts. In general, metallosalen-catalyzed reactions have been carried out
Cu and Au Metal-Organic Frameworks Bridge the Gap between Homogeneous and Heterogeneous Catalysts for Alkene Cyclopropanation Reactions
作者:Avelino Corma、Marta Iglesias、Francesc X. Llabrés i Xamena、Félix Sánchez
DOI:10.1002/chem.201000278
日期:2010.8.23
The copper and gold metal–organicframeworks (MOFs) [Cu3(BTC)2(H2O)3]n, [Cu3(BTC)2] (BTC=benzene‐1,3,5‐tricarboxylate), and IRMOF‐3‐SI‐Au are active and reusable solid catalysts for the cyclopropanation of alkenes with high chemo‐ and diastereoselectivities. This type of material gives better results than previous solid catalysts while working together with the homogeneouscatalysts. These MOFs can help
Asymmetric catalytic cyclopropanation of olefins: bis-oxazoline copper complexes
作者:Richard E Lowenthal、Atsushi Abiko、Satoru Masamune
DOI:10.1016/s0040-4039(00)98014-6
日期:1990.1
Bis-oxazolines (1–7) prepared from diethyl malonate and chiral amino alcohols were converted into their Cu(II) complexes which, upon activation, exhibit high enantioselectivity of up to 99 %ee for catalytic cyclopropanation of olefins.
2-alkyl-sufonylamino)phenyl-4-phenyl-1,3-oxazolines were found to be effective ligands for copper-catalyzed enantioselective cyclopropanation reaction of olefins. The reaction of styrene with d-menthyl diazoacetate in the presence of optically active coppercatalysts gave cyclopropanation products in a ratio of trans : cis = 83 : 17 with 63% cc (trans) and 84% cc (cis).