<scp>β‐Nitrostyrenes</scp>
as a valuable precursor for the synthesis of β‐aryl‐γ‐lactam and 2‐oxo‐1,2‐dihydroquinoline derivatives
作者:Dandamudi V. Lenin、Disha Patel、Payal Malvi
DOI:10.1002/jhet.4446
日期:2022.3
2-dihydroquinoline derivatives using β-nitrostyrenes. The reaction strategy involves the Michaeladdition followed by reduction and cyclization reactions. Michael adducts containing two different nitro group such as one on aryl ring and another on side chain, selectively takes the path to involve nitro group on aryl to form 2-oxo-1,2-dihydroquinoline derivatives as cyclized product. Michael adducts with
Divergent Reactivity of Nitrocyclopropanes with Huisgen Zwitterions and Facile Syntheses of 3-Alkoxy Pyrazolines and Pyrazoles
作者:Changjiang Yang、Wei Liu、Zijian He、Zhengjie He
DOI:10.1021/acs.orglett.6b02415
日期:2016.10.7
A novel annulation reaction of trans-2-substituted-3-nitrocyclopropane-1,1-carboxylates with in situ generated Huisgen zwitterions is reported, providing facile synthesis of 3-alkoxy pyrazolines in good yields and high diastereoselectivities. This reaction unveils the divergent reactivity of the nitrocyclopropanes as a kind of versatile donor–acceptor cyclopropanes. It is also demonstrated that the
Highly Enantioselective Michael
Addition of Malonates to Nitroolefins Catalyzed by Chiral
Bifunctional Tertiary Amine-Thioureas Based on Saccharides
作者:Jun-An Ma、Xiao-Juan Li、Kun Liu、Hai Ma、Jing Nie
DOI:10.1055/s-0028-1087370
日期:——
A series of saccharide-derived bifunctional tertiary amine-thioureas for the asymmetric Michaeladdition reaction have been designed and synthesized. The addition products between malonates and various nitroolefins were obtained in high yields (up to 99%) and excellentenantioselectivities (up to 99% ee).
macrocycle (MOM) with a large size was constructed by a well-designed organic ligand and nickel(II) ions via self-assembly. Incorporating thiourea groups as hydrogen-bond donors into a metal–organic complex system leads to a new approach for synthesizing functionalized heterogeneous catalysts, as this not only introduces coordination sites serving as chelators, but also overcomes the issues of self-association
An enantioselective Michael addition of malonate to nitroalkenes catalyzed by low loading demethylquinine salts in water
作者:Fu-Xin Chen、Cheng Shao、Quan Wang、Pin Gong、Dong-Yan Zhang、Bang-Zhi Zhang、Rui Wang
DOI:10.1016/j.tetlet.2007.09.168
日期:2007.11
An enantioselective Michaeladdition of malonate to nitroalkenes is efficiently catalyzed by low loading demethylquinine salts in water; the yield range from 49% to 93% and the ee up to 90%.