Enantioselective Construction of Tetrahydroquinolin-5-one-Based Spirooxindole Scaffold via an Organocatalytic Asymmetric Multicomponent [3 + 3] Cyclization
作者:Qiu-Ning Zhu、Yu-Chen Zhang、Meng-Meng Xu、Xiao-Xue Sun、Xue Yang、Feng Shi
DOI:10.1021/acs.joc.6b01598
日期:2016.9.2
e-based spirooxindole has been developed via a chiral cinchona alkaloid catalyzed asymmetric three-component [3 + 3] cyclization of cyclic enaminone, isatin, and malononitrile, which afforded a series of tetrahydroquinolin-5-one-based spirooxindoles in high yields and with excellent enantioselectivities (up to 99% yield, 97:3 er). This reaction could be applicable to large-scale synthesis of enantioenriched
The n.m.r. spectra of the four geometrical isomers of β-aminoenones, trans-s-trans, trans-s-cis, cis-s-trans, and cis-s-cis, are discussed. It was found that the chemical shift of the α-proton of β-aminoenones depends on both anisotropic effects and the electron density: δ=δ0–Δδstruc=ΔδAr+K(q–q0). Thus the conformation of non-rigid β-aminoenones can be determined from the observed and the calculated
Unexpected manganese(iii) acetate-mediated reactions of β-enamino carbonyl compounds with 1-(pyridin-2-yl)-enones under mechanical milling conditions
作者:Zi Liu、Guang-Peng Fan、Guan-Wu Wang
DOI:10.1039/c2cc36360g
日期:——
The solvent-free reactions of beta-enamino carbonylcompounds with 1-(pyridin-2-yl)-enones in the presence of manganese(iii) acetate dihydrate unexpectedly afforded 2-acyl-3-aryl-6,7-dihydro-4(5H)-benzofuran derivatives under mechanical milling conditions.
I<sub>2</sub>/O<sub>2</sub>-Promoted Domino Reactions of Isatins or 3-Hydroxyindolin-2-one Derivatives with Enaminones
作者:Wen-Juan Hao、Jian-Qiang Wang、Xiao-Ping Xu、Shi-Lei Zhang、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/jo401773j
日期:2013.12.20
I2-promoted domino reactions of isatins or 3-hydroxyindolin-2-one derivatives with enaminones under O2 conditions have been established. The reactions of isatins with enaminones afforded functionalized tetracyclic pyrrolo[2,3,4-kl]acridine derivatives in moderate to good yields through domino cyclization and C–H oxidation. The reactions of 3-hydroxyindolin-2-one derivatives with enaminones proceeded well
Cu catalyzed cross-dehydrogenative coupling reaction for the synthesis of 3-hydroxy-2-pyrrolidinones
作者:Rajib Sarkar、Chhanda Mukhopadhyay
DOI:10.1016/j.tetlet.2018.06.061
日期:2018.8
regioselective CC coupling has been developed. This is a Cu (II) catalyzed cross dehydrogenative coupling (CDC) involving enamino-ketones of benzyl amines and di-alkyl acetylenedicarboxylate, followed by cyclization by primary amines. TBHP (tert-butyl hydroperoxide) has been used as the oxidant to promote the coupling protocol. This synthetic route principally demonstrates the scope of CDC reaction and also