Copper-Mediated Trifluoromethylation of α-Diazo Esters with TMSCF<sub>3</sub>: The Important Role of Water as a Promoter
作者:Mingyou Hu、Chuanfa Ni、Jinbo Hu
DOI:10.1021/ja307058c
日期:2012.9.19
Copper-mediatedtrifluoromethylation of α-diazo esters with TMSCF(3) reagent has been developed as a new method to prepare α-trifluoromethyl esters. This trifluoromethylation reaction represents the first example of fluoroalkylation of a non-fluorinated carbene precursor. Water plays an important role in promoting the reaction by activating the "CuCF(3)" species prepared from CuI/TMSCF(3)/CsF (1.0:1
Copper-mediated synthesis of α-trifluoromethylselenolated esters
作者:Taotao Chen、Yi You、Zhiqiang Weng
DOI:10.1016/j.jfluchem.2018.10.002
日期:2018.12
A copper-mediated synthesis of α-trifluoromethylselenolated esters was developed. Trifluoromethylselenolation of the aromatic and aliphatic α-diazo esters with [(bpy)Cu(SeCF3)]2 afforded α-trifluoromethylselenolated esters in good to excellent yields. Various important functional groups were tolerated in the ortho, meta, and para positions of the phenyl rings.
Visible-Light-Induced Catalysis: A Regioselectivity Switch between [2+1] and [2+2] Cycloaddition of Diazocarbonyls with Olefins
作者:Jian Lv、Huixin Qiu、Lirong Wen
DOI:10.1055/a-1786-6496
日期:2022.9
Visible-light-promoted [2+1] and [2+2] cycloadditionreactions of diazocarbonyls with olefins have been developed, affording functionalized cyclopropanes and cyclobutanes, respectively. In visible-light catalysis of Ir(ppy)3, a simple addition of Rh2(OAc)4 switches the regioselectivity from [2+1] to [2+2] cycloaddition with good reactivity and high regioselectivity.
alpha-Diazoesters were discovered to be good electrophiles in a catalytic asymmetric alpha-functionalization of ketones for the first time. This reaction also provided a direct and efficient method for C-N bond formation with excellent yields (up to 98%) and enantioselectivities (up to 99% ee) under mild conditions. The application of the electrophilicity of alpha-diazoesters opens up a novel way to access the diversity of diazo chemistry.
Copper-Mediated Deuterotrifluoromethylation of <i>α</i>
?Diazo Esters
作者:Mingyou Hu、Qiqiang Xie、Xinjin Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/cjoc.201600004
日期:2016.5
ation of α?diazo esters under the promotion of deuterium oxide (D2O) has been developed for the synthesis of deuterium‐labeled trifluoromethyl compounds. This deuterotrifluoromethylation reaction is of broad scope and can afford the deuterated products with higher than 99% isotopic purity. Moreover, the results of this investigation also provide some experimental evidences to support our previously