The Experts below are selected from a list of 1896 Experts worldwide ranked by ideXlab platform
Runtao Li - One of the best experts on this subject based on the ideXlab platform.
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efficient direct asymmetric vinylogous michael addition reactions of γ butenolides to chalcones catalyzed by vicinal Primary Diamine salts
Chemical Communications, 2010Co-Authors: Junfeng Wang, Chao Qi, Zemei Ge, Tieming Cheng, Runtao LiAbstract:The first direct organocatalytic asymmetric vinylogous Michael addition reactions of γ-butenolides to chalcones have been developed by using chiral 1,2-diaminocyclohexane as a novel organocatalyst via a di-iminium transition state to provide syn-Michael products with good yields, high diastereoselectivities and enantioselectivities (up to 78% yield, >99 : 1 dr and 96% ee).
Xin Wang - One of the best experts on this subject based on the ideXlab platform.
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Asymmetric Michael addition reactions of pyrrolones with chalcones catalyzed by vicinal Primary-Diamine salts
RSC Advances, 2017Co-Authors: Du Xiaolei, Dawei Yin, Xin WangAbstract:The efficient asymmetric Michael addition reactions of pyrrolones with chalcones catalyzed by a simple and commercially available chiral 1,2-diaminocyclohexane-2-(N-Boc-amino)benzoic acid have been developed to provide the corresponding Michael adducts in good yields (up to 90%) and high enantioselectivities (up to 95% ee).
Wim Dehaen - One of the best experts on this subject based on the ideXlab platform.
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Molecular recognition of nitrogen – containing bases by Zn[5,15-bis-(2,6-dodecyloxyphenyl)]porphyrin
Supramolecular Chemistry, 2016Co-Authors: Olga V. Maltceva, Galina M. Mamardashvili, Ilya A. Khodov, Dmitriy A. Lazovskiy, Veronika Khodova, Michael A. Krestyaninov, Nugzar Zh. Mamardashvili, Wim DehaenAbstract:AbstractBy means of spectrophotometric titration and 1H NMR spectroscopy, the selective binding ability of the Zn-5,15-bis-(2,6-dodecyloxyphenyl)porphyrin towards nitrogen containing organic molecules of various nature has been studied. It has been found that the presence of long alkoxy substituents at the ortho-positions of the Zn-porphyrin phenyl rings prevents the axial coordination of tertiary amines and, conversely, creates favourable conditions for binding of a Primary Diamine due to the presence of additional binding sites, namely the oxygen atoms of the ortho–ortho′- dodecyloxy substituents of the meso phenyl groups. The formation of stable complexes with multiple binding sites has been confirmed by DFT quantum chemical calculations and two-dimensional NMR experiments.
Junfeng Wang - One of the best experts on this subject based on the ideXlab platform.
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efficient direct asymmetric vinylogous michael addition reactions of γ butenolides to chalcones catalyzed by vicinal Primary Diamine salts
Chemical Communications, 2010Co-Authors: Junfeng Wang, Chao Qi, Zemei Ge, Tieming Cheng, Runtao LiAbstract:The first direct organocatalytic asymmetric vinylogous Michael addition reactions of γ-butenolides to chalcones have been developed by using chiral 1,2-diaminocyclohexane as a novel organocatalyst via a di-iminium transition state to provide syn-Michael products with good yields, high diastereoselectivities and enantioselectivities (up to 78% yield, >99 : 1 dr and 96% ee).
Du Xiaolei - One of the best experts on this subject based on the ideXlab platform.
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Asymmetric Michael addition reactions of pyrrolones with chalcones catalyzed by vicinal Primary-Diamine salts
RSC Advances, 2017Co-Authors: Du Xiaolei, Dawei Yin, Xin WangAbstract:The efficient asymmetric Michael addition reactions of pyrrolones with chalcones catalyzed by a simple and commercially available chiral 1,2-diaminocyclohexane-2-(N-Boc-amino)benzoic acid have been developed to provide the corresponding Michael adducts in good yields (up to 90%) and high enantioselectivities (up to 95% ee).