We report herein that the conjugate reduction of α,β-unsaturated esters and amides, such as aryl acrylates, pantolactone esters of acrylic acids, diethyl itaconate and N-crotonylcamphorsultam, with tributyltinhydride proceeded in moderate to high yields in the presence of magnesium bromide diethyl etherate. The effect of metal halide enhancing the yields is also described.
Isothiourea-Catalyzed Enantioselective Synthesis of Tetrahydro-α-carbolinones
作者:Honglei Liu、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1021/acs.orglett.9b04615
日期:2020.2.21
An isothiourea-catalyzed enantioselective annulation protocol using indolin-2-imines with a series of α,β-unsaturated p-nitrophenyl esters for the synthesis of tetrahydro-α-carbolinones was developed. Using 5 mol % of the isothiourea HyperBTM as the Lewis base catalyst, this process allows the enantioselective preparation of a range of C(4)-substituted tetrahydro-α-carbolinones in good to excellent
USE OF GLYCEROL ETHERS AS ACTIVATORS OF THE BIOLOGICAL EFFECTS OF A HERBICIDE, FUNGICIDE OR INSECTICIDE SUBSTANCE
申请人:Parant Bernard
公开号:US20120214671A1
公开(公告)日:2012-08-23
The invention relates to the use of glycerol ethers as agents that activate the biological effects of at least one substance selected from a herbicide, fungicide or insecticide. The invention essentially relates to the use of glycerol ether as an agent that activates the biological effects of at least one substance selected from a herbicide, or fungicide or insecticide, said glycerol ether having formula (1), wherein R
1
represents an alkyl group having between 1 and 18 carbon atoms and R
2
represents a hydrogen atom or an alkyl group having between 1 and 18 carbon atoms, preferably a methyl or ethyl group. The invention also relates to a phytosanitary composition containing one such glycerol ether, as well as to a phytosanitary treatment method using said composition.
Conjugate reduction of aryl acrylates with tributyltin hydride in the presence of magnesium bromide diethyl etherate
作者:Satomi Hirasawa、Hajime Nagano、Yoko Kameda
DOI:10.1016/j.tetlet.2004.01.028
日期:2004.3
The conjugate reduction of aryl acrylates performed with tributyltinhydride in the presence of magnesium bromide diethyl etherate in dichloromethane gave the corresponding saturated esters in moderate to high yields. The reduction of α-methylene-γ-benzyloxycarboxylic acid esters proceeded syn-selectively, but α-methylene-β-oxycarboxylic acid esters afforded reductive elimination products under the