366799-82-8Relevant articles and documents
A new asymmetric activation strategy for hydrazones as acyl anion equivalents in the bimetallic catalyzed carbonyl-ene reaction
Hu, Wen-Bo,Song, Xixi,Wang, Min-Can
, p. 2055 - 2062 (2021)
A new asymmetric activation strategy for hydrazones as acyl anion equivalents is developed in the bimetallic catalyzed carbonyl-ene reaction of isatins and hydrazones. Under mild conditions, optically active functionalized 3-hydroxy-2-oxindoles were furnished in up to 98% yield with up to 97% enantioselectivity. In this process, formaldehydetert-butylhydrazone which is seldom employed in asymmetric carbonyl-ene reactions accelerated by a metallic catalyst can be activated well by a Br?nsted base. A possible catalytic cycle is proposed.
Direct catalytic synthesis of β-(C3)-substituted pyrroles: A complementary addition to the Paal-Knorr reaction
Pawar, Amol Prakash,Yadav, Jyothi,Mir, Nisar Ahmad,Iype, Eldhose,Rangan, Krishnan,Anthal, Sumati,Kant, Rajni,Kumar, Indresh
supporting information, p. 251 - 254 (2021/01/13)
The synthesis of β-(C3)-functionalized pyrroles is a challenging task and requires a multistep protocol. An operationally simple direct catalytic synthesis of β-substituted pyrroles has been developed. This one-pot multicomponent method combined aqueous succinaldehyde as 1,4-dicarbonyl, primary amines, and isatins to access hydroxyl-oxindole β-tethered pyrroles. Direct synthesis of the β-substituted free NH-pyrrole is the central intensity of this work. DFT-calculations and preliminary mechanism investigation support the possible reaction pathway. This journal is
Palladium catalyzed divergent cycloadditions of vinylidenecyclopropane-diesters with methyleneindolinones enabled by zwitterionic π-propargyl palladium species
Niu, Ben,Wei, Yin,Shi, Min
supporting information, p. 4783 - 4786 (2021/05/25)
A palladium-catalyzed divergent synthesis of spirooxindoles fused with a five- or a six-membered ring by a cycloaddition reaction of vinylidenecyclopropane-diesters with methyleneindolinones was disclosed. This protocol features anin situgenerated unprecedented zwitterionic π-propargyl palladium species in cycloaddition reactions and a switchable process between (3+2) and (4+2) cycloadditions by changing the phosphine ligand.