Facet-Dependent Catalytic Activity of Palladium Nanocrystals in Tsuji-Trost Allylic Amination Reactions with Product Selectivity
作者:Kaushik Chanda、Sourav Rej、Shu-Ya Liu、Michael H. Huang
DOI:10.1002/cctc.201500300
日期:2015.6.15
demonstrated to catalyze the amination reaction by using a wide variety of substituted anilines, but the cubes were the best catalyst with consistently the highest efficiency, product yield, and product selectivity. This work demonstrates that the use of metal nanocrystals with proper facet control is important for catalyzing coupling reactions with product selectivity.
Chloroacetanilides having a selective herbicidal activity,
申请人:Montedison S.p.A.
公开号:US04224050A1
公开(公告)日:1980-09-23
Chloroacetanilides are disclosed having the general formula: ##STR1## wherein R.sup.1 =H, or alkyl with 1-5 carbon atoms, or X; X=alkenyl, and preferably ##STR2## in which the various R.sup.2, which may be equal to or different from each other, are H or an alkyl with 1-3 carbon atoms; A=alkylene, optionally substituted, of the formula: ##STR3## in which the various R.sup.2, which may be equal to or different from each other, have the meanings specified above; and Y=H; alkyl with 1-5 carbon atoms; alkenyl with 2-5 carbon atoms; alkinyl with 2-5 carbon atoms; phenyl; cycloalkyl with 3-8 carbon atoms; halogen; ##STR4## wherein R=H; alkyl with 1-5 carbon atoms; alkenyl or alkinyl with 2-5 carbon atoms; cycloalkyl with 3-8 carbon atoms; phenyl; The chloroacetanilide derivatives are useful in combatting infestations of infesting monocotyledons and dicotyledons during pre-emergence, by spreading the chloroacetanilide derivative on the soil adjacent thereto in quantities ranging from 0.25 kg/ha upwards.
Green Organocatalytic Synthesis of Indolines and Pyrrolidines from Alkenes
作者:Alexis Theodorou、Christoforos G. Kokotos
DOI:10.1002/adsc.201601262
日期:2017.5.2
efficient 2,2,2‐trifluoroacetophenone‐catalyzed oxidation of alkenes, which utilizes H2O2 as the green oxidant, a novel and sustainable synthesis of indolines and pyrrolidines was developed. This constitutes a cheap, general and environmentally‐friendly protocol for the synthesis of substituted nitrogen‐containing heterocycles. A variety of substitution patterns, both aromatic and aliphatic moieties, are well
利用绿色,高效的2,2,2-三氟苯乙酮催化的烯烃氧化,利用H 2 O 2作为绿色氧化剂,开发了新颖且可持续的二氢吲哚和吡咯烷的合成方法。这构成了用于合成取代的含氮杂环的廉价,通用且环境友好的方案。芳香族和脂肪族部分的各种取代方式都具有良好的耐受性,从而以良好至极佳的收率产生了所需的氮杂环。
A Metal-Free Approach to the Synthesis of Indoline Derivatives by a Phenyliodine(III) Bis(trifluoroacetate)-Mediated Amidohydroxylation Reaction
A novel approach to the synthesis of indoline derivatives is presented. The key cyclization step features the phenyliodine(III) bis(trifluoroacetate)- (PIFA-) mediated formation of a N-acylnitrenium ion and its succeeding intramolecular trapping by the olefin fragment. In addition, difunctionalization of the alkene moiety is achieved since the in situ generation of an additional hydroxy group at the
the imine-enamine equilibrium. One important improvement related to Fischer indole synthesis is direct vinylation of aryl hydroxyamines (Scheme 1b). Transition metal-catalyzed coupling with vinyl derivatives,23-27 gold-catalyzed addition to alkynes,28, 29 and conjugateaddition to electron-withdrawing alkynes30-33 have been used to achieve O-vinylation of N-aryl hydroxyamine, which is then followed by