Catalytic Enantioselective Direct Aldol Addition of Aryl Ketones to α‐Fluorinated Ketones
作者:Connor J. Thomson、David M. Barber、Darren J. Dixon
DOI:10.1002/anie.201916129
日期:2020.3.23
catalytic enantioselective synthesis of α-fluorinated chiral tertiary alcohols from (hetero)aryl methyl ketones is described. The use of a bifunctional iminophosphorane (BIMP) superbase was found to facilitate direct aldol addition by providing the strong Brønsted basicity required for rapid aryl enolate formation. The new synthetic protocol is easy to perform and tolerates a broad range of functionalities
描述了由(杂)芳基甲基酮催化合成α-氟化手性叔醇的对映体。发现使用双功能亚氨基正膦(BIMP)超碱可通过提供快速形成芳基烯醇酸酯所需的强布朗斯台德碱度,促进直接添加羟醛。新的合成方案易于执行,并具有高对映选择性(高达> 99:1 er),可耐受各种功能和杂环。已经证明了多克的可扩展性以及催化剂的回收和再循环。1 H NMR研究表明,与现有技术水平的催化体系相比,BIMP催化的速率提高了1400倍。通过合成各种对映体丰富的结构单元和杂环,突出了醛醇产品的实用性,其中包括:
INSECTICIDAL ARYL ISOXAZOLINE DERIVATIVES
申请人:Mihara Jun
公开号:US20100179194A1
公开(公告)日:2010-07-15
The present invention relates to novel aryl isoxazoline derivatives having excellent insecticidal activity as insecticides and represented by the formula:
and their use as insecticides and acarizides.
Copper-Mediated Trifluoroacetylation of Arenediazonium Salts with Ethyl Trifluoropyruvate
作者:Wei Wu、Qinli Tian、Taotao Chen、Zhiqiang Weng
DOI:10.1002/chem.201604300
日期:2016.11.7
A copper‐mediated trifluoroacetylation of various arenediazoniumsalts with ethyl trifluoropyruvate is reported. The reaction proceeded smoothly under mild conditions at room temperature giving trifluoromethyl aryl ketones in moderate to good yields. A variety of functional groups, including methoxy, hydroxy, ester, ketone, trifluoromethyl, and halide groups, were well tolerated. A possible reaction
trifluoromethyl ketones from readily available methyl esters using the potent greenhouse gas fluoroform (HCF3, HFC-23) was developed. The combination of fluoroform and KHMDS in triglyme at −40 °C was effective for this transformation, with good yields as high as 92%. Substrate scope of the trifluoromethylation procedure was explored for aromatic, aliphatic, and conjugated methyl esters. This study presents
Condensed-ring aryl compounds of formula (I) and use of the same as a agrochemical for controlling noxious organisms wherein (X)
m
Q, A, R
1
, (Y)
n
and the grouping —W
1
—W
2
—W
3
—W
4
— are as defined herein.