Palladium-catalysed carbonylative α-arylation of nitromethane
作者:Zhong Lian、Stig D. Friis、Troels Skrydstrup
DOI:10.1039/c5cc00123d
日期:——
A palladium-catalysed approach to α-nitroketonesviacarbonylative α-arylation of nitromethane is presented, thus providing easy access to key intermediates and important heterocycles.
通过钯催化的方法,通过对硝基甲烷进行羰基化的α芳基化,从而提供了对关键中间体和重要杂环的便捷访问。
New methods and reagents in organic synthesis. 9. C-Acylation of nitromethane with aromatic carboxylic acids using diethyl phosphorocyanidate (DEPC).
作者:YASUMASA HAMADA、KIYOKO ANDO、TAKAYUKI SHIOIRI
DOI:10.1248/cpb.29.259
日期:——
Aromatic α-nitroketones can be conveniently prepared from aromatic carboxylic acids and nitromethane by the action of diethyl phosphorocyanidate (DEPC) in the presence of triethylamine.
Organocatalytic Insertion of Isatins into Aryl Difluoronitromethyl Ketones
作者:Ransheng Ding、Pegah R. Bakhshi、Christian Wolf
DOI:10.1021/acs.joc.6b02704
日期:2017.1.20
An organocatalytic method that achieves insertion of isatins into aryl difluoronitromethyl ketones under mild conditions is described. The reaction occurs in the presence of 20 mol % of DBU and with 100% atom economy. A series of isatin derived difluoronitromethyl substituted tertiary alcohol benzoates and naphthoates were prepared in 81–99% yield. The general synthetic usefulness of these 3-hydroxyoxindole
Organocatalytic Asymmetric Domino Michael/Acyl Transfer Reaction between γ/δ-Hydroxyenones and α-Nitroketones
作者:Keshab Mondal、Subhas Chandra Pan
DOI:10.1021/acs.joc.8b00436
日期:2018.5.4
An organocatalyticasymmetric domino Michael/acyl transfer reaction has been developed between γ/δ-hydroxyenones and α-nitroketones. Cinchona alkaloid derived bifunctional amino-squaramide catalysts were found to be the best catalysts for this reaction. The products having nitro, keto, and ester functionalities were obtained in high yields and with excellent enantioselectivities, and also a few synthetic
Organocatalytic asymmetric cascade 1,6-addition/hemiketalization/retro-Henry reaction of <i>ortho</i>-hydroxyphenyl-substituted <i>p</i>-QMs with α-nitroketones
A novel organocatalyticasymmetriccascade 1,6-addition/hemiketalization/retro-Henry reaction of ortho-hydroxyphenyl-substituted p-QMs with α-nitroketones is described. A variety of novel chiral 2-(1-(4-hydroxyphenyl)ethyl)phenols are constructed for the first time with high yields (up to 92%) and excellent enantioselectivities (up to >99% ee) under mild reaction conditions. A gram-scale experiment