Synthesis of 3-nitroindoles by sequential paired electrolysis
作者:Ashley C. Lindsay、Paul A. Kilmartin、Jonathan Sperry
DOI:10.1039/d1ob01453f
日期:——
methods for the preparation hinder their widespread application. Herein, we report that nitroenamines undergo electrochemical cyclisation to 3-nitroindoles in the presence of potassium iodide. Detailed control experiments and cyclic voltammogram studies infer the reaction proceeds via a sequential paired electrolysis process, beginning with anodic oxidation of iodide (I−) to the iodine radical (I˙),
α-Nitro-α,β-Unsaturated Ketones: An Electrophilic Acyl Transfer Reagent in Catalytic Asymmetric Friedel–Crafts and Michael Reactions
作者:Chandrakanta Parida、Rajendra Maity、Subas Chandra Sahoo、Subhas Chandra Pan
DOI:10.1021/acs.orglett.9b02310
日期:2019.9.6
α-nitro-α,β-unsaturated ketones as efficient electrophilic acyl transfer reagents, and they were employed in Friedel-Crafts as well as in Michael reactions. The desired acyl transfer products of these reactions were obtained in high yields with high to excellent enantioselectivities with t-leucine-derived squaramide catalyst under mild reaction conditions. Few applications including a synthesis of the isoxazoline
Organocatalytic Asymmetric Domino Michael/Acyl Transfer Reaction Between <i>α</i>
-Nitroketones and <i>in situ-</i>
Generated <i>ortho</i>
-Quinone Methides: Route to 2-(1-Arylethyl)phenols
作者:Chandan Gharui、Debasmita Behera、Subhas Chandra Pan
DOI:10.1002/adsc.201801015
日期:2018.12.3
organocatalytic asymmetric domino Michael/acyl transfer reaction between α‐nitroketones and o‐quinone methides is disclosed. o‐Quinone methides are generated in situ from 2‐sulfonylmethylphenols in basic medium. With 10 mol% of bifunctional squaramide catalyst, high yields and excellent enantioselectivities are achieved for a variety of O‐acyl 2‐(1‐arylethyl)phenols under mild reaction condition.
3-Benzoylisoxazolines by 1,3-Dipolar Cycloaddition: Chloramine-T-Catalyzed Condensation of α-Nitroketones with Dipolarophiles
作者:Xinhui Pan、Xiaobing Xin、Ying Mao、Xin Li、Yanan Zhao、Yidi Liu、Ke Zhang、Xiaoda Yang、Jinhui Wang
DOI:10.3390/molecules26123491
日期:——
In this study, 3-benzoylisoxazolines were synthesized by reacting alkenes with various α-nitroketones using chloramine-T as the base. The scope of α-nitroketones and alkenes is extensive, including different alkenes and alkynes to form various isoxazolines and isoxazoles. The use of chloramine-T, as the low-cost, easily handled, moderate base for 1,3-dipolar cycloaddition is attractive.
Organocatalytic Asymmetric Michael-Acyl Transfer Reaction of α-Nitroketones with 2-Hydroxybenzylidene Ketones
作者:Rajendra Maity、Subas Chandra Sahoo、Subas Chandra Pan
DOI:10.1002/ejoc.201900069
日期:2019.3.31
This paper depicts primary amine catalyzed asymmetric cascade Michael–acyl transfer reaction of α‐nitroketones and 2‐hydroxybenzylidene ketones. The desired products having nitro, keto, and ester functionalities were obtained in high yields with excellent enantioselectivities under mild reaction conditions.