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。
Organocatalytic asymmetric Michael/hemiacetalization/acyl transfer reaction of α-nitroketones with <i>o</i>-hydroxycinnamaldehydes: synthesis of 2,4-disubstituted chromans
作者:Rajendra Maity、Subhas Chandra Pan
DOI:10.1039/c8ob00078f
日期:——
An organocatalyticasymmetriccascadeMichael/hemiketalization/acyl transfer reaction between o-hydroxycinnamaldehydes and α-nitroketones is developed. Prolinol TMS ether catalyst in combination with benzoic acid was found to be the most effective for this reaction which proceeds through an equilibrium of lactols to provide a single diastereomer of enantiopure 2,4-disubstituted chromans.
Organocatalytic Asymmetric Michael/Hemiketalization/Retro-aldol Reaction of α-Nitroketones with Unsaturated Pyrazolones: Synthesis of 3-Acyloxy Pyrazoles
作者:Rajendra Maity、Chandan Gharui、Arun K. Sil、Subhas Chandra Pan
DOI:10.1021/acs.orglett.6b03823
日期:2017.2.3
An organocatalyticasymmetriccascadeMichael/hemiketalization/retro-aldol reaction between unsaturated pyrazolones and α-nitroketones is described. A bifunctional thiourea catalyst was found to be efficient for this reaction. With 10 mol % of catalyst, high yields as well as excellent enantioselectivities are attained for a variety of 3-acyloxy pyrazoles under mild reaction conditions.
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.
Asymmetric Bioreduction of β-Acylaminonitroalkenes: Easy Access to Chiral Building Blocks with Two Vicinal Nitrogen-Containing Functional Groups
作者:Elisabetta Brenna、Michele Crotti、Francesco G. Gatti、Daniela Monti、Fabio Parmeggiani、Sara Santangelo
DOI:10.1002/cctc.201700063
日期:2017.7.7
conversion and excellent enantioselectivity and shows a wide substrate scope. The reduced products are valuable chiral synthons characterized by two vicinal nitrogen‐containing functional groups that can be further modified by functional group inter‐conversion thanks to the synthetic versatility of the nitro moiety. The chemo‐enzymatic synthesis of (R)‐N,N′‐(1‐phenylethane‐1,2‐diyl)diacetamide from