Synthesis and application of modified silica sulfuric acid as a solid acid heterogeneous catalyst in Michael addition reactions
作者:Mohammad Ali Zolfigol、Hojat Veisi、Farajollah Mohanazadeh、Alireza Sedrpoushan
DOI:10.1002/jhet.659
日期:2011.7
Modified silicasulfuricacid (MSSA) as a new type of silicasulfuricacid was prepared and effectively used in the conjugate addition of indole, pyrrole, and thiols with Michael acceptors under mild conditions at room temperature. Also, MSSA was used as a catalyst for the synthesis of 1,1,3‐tri‐indolyl compounds in good to excellent yield at room temperature. J. Heterocyclic Chem., (2011).
Poly(N,N′-dibromo-N-ethyl-benzene-1,3-disulfonamide), N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide as new reagents for conjugate addition of indole, pyrrole with α,β-unsaturated ketones
作者:R. Ghorbani-Vaghei、S. Hajinazari、M. Engashte
DOI:10.1007/s13738-012-0087-2
日期:2012.10
Poly(N,N′-dibromo-N-ethyl-benzene-1,3-disulfonamide) [PBBS] and N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide[TBBDA] were used as efficient reagents for conjugate addition of indole and pyrrole with α,β-unsaturated ketones and also, double-conjugate 1,4-addition of indoles to dibenzylidenacetones.
Catalytic conjugate addition of indole to α,β-unsaturated ketones by Co(ClO4)2·6H2O/bis-Schiff base complexes
作者:Yong Hai Hui、Chun Mei Chen、Zheng Feng Xie
DOI:10.1016/j.cclet.2012.03.015
日期:2012.5
Co(ClO4)2·6H2O/bis-Schiff base complexes promoted the conjugateaddition of indole to α,β-unsaturated ketones under mild conditions, giving the corresponding addition products with high yields. And the complex has been characterized with XRD and IR.
Co(ClO 4)2 ·6H 2 O /双-席夫碱配合物在温和条件下促进了吲哚向α,β-不饱和酮的共轭加成反应,从而以高收率得到了相应的加成产物。并用XRD和IR对复合物进行了表征。
Al-MCM-41 as a mild and ecofriendly catalyst for Michael addition of indole to α,β-unsaturated ketones
Mesoporous Al-MCM-41 catalyzes the chemoselective Michael addition reaction between indoles and alpha,beta-unsaturated ketones to afford beta-indolylketones at room temperature with excellent yields. The higher catalytic activity is attributed to Lewis acidic Al and the large surface area. The catalyst is readily recovered and reused more than six times without loss in its catalytic activity. The substitution at the indole nucleus occurs exclusively at the 3-position and N-alkylation products are not observed. (C) 2012 Elsevier B.V. All rights reserved.