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.
synthesis of thieno[2,3-b]indole derivatives. This method combined four C-H σ-bond cleavage reactions of two different kinds of C-H bonds and two C-S σ-bond formation processes. A series of thieno[2,3-b]indoles were obtained starting from 3-benzylindole derivatives with good yields and high regioselectivity, with the elemental sulfur serving as a cheap and readily available sulfur source. Good efficiency
The inexpensive Br2 can serve as a novel Lewis acid catalyst for Friedel–Crafts alkylation of indoles with α,β-unsaturatedketones. Under the catalysis of only 3 mol % of Br2, this Michael addition proceeded smoothly with high efficiency and broad substrate scope. Moreover, theoretical calculations suggested that Br2 possesses only the modest power to activate chalcones and is inferior to most tested
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。
Ultrasound-accelerated Michael Addition of Indole to α,β-Unsaturated Ketones Catalyzed by Ceric Ammonium Nitrate (CAN)
作者:Shun-Jun Ji、Shun-Yi Wang
DOI:10.1055/s-2003-41463
日期:——
Ceric ammonium nitrate efficientlycatalyzes the Michaeladdition of indole to α,β-unsaturated carbonyl ketones by means of alkylation of indole under ultrasonic irradiation to afford the corresponding adduct in excellentyields. The substitution on the indole nucleus occurred exclusively at the 3-position, and N-alkylation products have not been observed.