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Fast, solvent-free and hydrogen-bonding-mediated asymmetric Michael addition in a ball mill
The chiral squaramide derivatives as hydrogen bonding catalyst for the Michael addition reactions of 1,3-dicarbonyl compounds to nitroolefins under solvent-free conditions was developed using a… Expand
A chiral thioureido acid as an effective additive for enantioselective organocatalytic Michael additions of nitroolefins.
- Dan-Qian Xu, Huadong Yue, Shu-Ping Luo, Ai-Bao Xia, Shuai Zhang, Zhen-yuan Xu
- Chemistry, Medicine
- Organic & biomolecular chemistry
- 5 June 2008
A novel and effective organocatalytic system consisting of pyrrolidinyl-thioimidazole and a chiral thioureido acid efficiently catalyzed the asymmetric Michael addition reactions of ketones to… Expand
Fischer Indole Synthesis in Brønsted Acidic Ionic Liquids: A Green, Mild, and Regiospecific Reaction System
A novel one-pot Fischer indole synthesis approach has been developed by using Bronsted acidic ionic liquids as dual solvent-catalysts. Yields of 83–97 % were obtained after reaction in BMImHSO4 at… Expand
Pyrrolidine–pyridinium based organocatalysts for highly enantioselective Michael addition of cyclohexanone to nitroalkenes
Abstract A novel class of pyrrolidine–pyridinium based organocatalysts has been developed and demonstrated to efficiently catalyze the asymmetric Michael addition reactions of unmodified… Expand
Chiral squaramides as highly enantioselective catalysts for Michael addition reactions of 4-hydroxycoumarins and 4-hydroxypyrone to beta,gamma-unsaturated alpha-keto esters.
In situ enamine activation in aqueous salt solutions: highly efficient asymmetric organocatalytic Diels-Alder reaction of cyclohexenones with nitroolefins.
Deep-sea Diels-Alder: The asymmetric organocatalytic Diels-Alder reaction of cyclohexenones with aromatic nitroolefins can be carried out in seawater and brine. The reaction proceeds by an in situ… Expand
A Novel Enantioselective Catalytic Tandem Oxa‐Michael–Henry Reaction: One‐Pot Organocatalytic Asymmetric Synthesis of 3‐Nitro‐2H‐chromenes
An enantioselective oxa-Michael-Henry reaction of substituted salicylaldehydes with nitroolefins that proceeds though an aromatic iminium activation (AIA) has been developed by using a chiral… Expand
Regiospecific synthesis of nitroarenes by palladium-catalyzed nitrogen-donor-directed aromatic C-H nitration.
Fast and Selective Dehydrogenative C–H/C–H Arylation Using Mechanochemistry
A fast and site-selective biaryl synthesis via dehydrogenative C–H/C–H arylation in a ball mill was developed. In this paper, both electron-deficient oximes and electron-rich anilides quickly and… Expand
Mild and versatile nitrate-promoted C-H bond fluorination.
A novel and facile C-H bond fluorination proceeds under remarkably mild conditions (close to room temperature in most cases). Both aromatic and olefinic C(sp(2))-H bonds with a wide range of… Expand