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).
In situ generation of Iron(<scp>iii</scp>) dodecyl sulfate as Lewis acid-surfactant catalyst for synthesis of bis-indolyl, tris-indolyl, Di(bis-indolyl), Tri(bis-indolyl), tetra(bis-indolyl)methanes and 3-alkylated indole compounds in water
Iron(III) dodecyl sulfate as Lewis acid-surfactant catalyst was prepared in situ and effectively used in the synthesis of bis(indolyl)methanes and Michael reactions of indoles with α,β-unsaturated carbonyl compounds in water. Also, this method was used for the synthesis of 1,1,3-tri-indolyl compounds, producing good to excellent yield at room temperature.
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.
The Michael Addition of Indole to α,β-Unsaturated Ketones Catalyzed by Iodine at Room Temperature
作者:Shun-Jun Ji、Teck-Peng Loh、Shun-Yi Wang
DOI:10.1055/s-2003-42105
日期:——
Indole undergoes conjugate addition with α,β-unsaturated ketones by means of alkylation of indole in the presence of a catalytic amount of molecular I 2 at room temperature to afford the corresponding adduct in excellent yields (up to 96%). The substitution on the indole nucleus occurred exclusively at the 3-position. N-alkylation products have not been observed.
在室温下,在催化量的分子 I 2 存在下,吲哚通过吲哚的烷基化与 α,β-不饱和酮进行共轭加成,以优异的产率(高达 96%)得到相应的加合物。吲哚核上的取代仅发生在 3 位。未观察到 N-烷基化产物。
Asymmetric Friedel-Crafts Alkylation of Indole with Chalcones Catalyzed by Chiral Phosphoric Acids
作者:Arrigo Scettri、Rosaria Villano、Maria Acocella
DOI:10.3390/molecules14083030
日期:——
The reaction of indole with chalcones, to give Michael-type adducts, was found to occur with good efficiency (up to 98% yield) and moderate enantioselectivity (up to 52% e.e.) in the presence of a chiral BINOL-based phosphoricacid. Furthermore, the alkylation products can be obtained in much higher e.e.s after one only crystallization.
发现吲哚与查耳酮反应生成迈克尔型加合物,在手性 BINOL 型磷酸存在下以良好的效率(高达 98% 的产率)和中等的对映选择性(高达 52% ee)发生。此外,仅在一次结晶后可以以更高的 ee 获得烷基化产物。