B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Michael Reactions: Aromatic C–H as Nucleophiles
作者:Wu Li、Thomas Werner
DOI:10.1021/acs.orglett.7b00720
日期:2017.5.19
The Michael reaction is a widely used reaction for the C–C coupling of electron-poor olefins and C(sp3)–H pronucleophiles. Herein we report the Michael reaction between alkenes and aromatic as well as heteroaromatic compounds as aromatic C(sp2)–H nucleophiles under mild conditions. The reaction is catalyzed by readily available Lewisacidic B(C6F5)3 and proceeds with high regioselectivity for a wide
迈克尔反应是贫电子烯烃与C(sp 3)-H前亲核试剂的C-C偶联反应中广泛使用的反应。在这里,我们报道了在温和条件下烯烃与芳香族以及杂芳香族化合物(如芳香族C(sp 2)–H亲核体)之间的迈克尔反应。该反应被易得的路易斯酸性B(C 6 F 5)3催化,并在较大的底物范围内以高区域选择性进行。
Triflic Acid–Catalyzed Michael Reactions of Indole and Pyrrole Compounds with α,β‐Unsaturated Ketones in Water
作者:Hai‐Bo Zhang、Li Liu、Yu‐Liang Liu、Yong‐Jun Chen、Jun Wang、Dong Wang
DOI:10.1080/00397910601031504
日期:2007.2.1
Abstract The Michael reactions of indole and pyrrole compounds to α,β‐unsaturated ketones catalyzed by triflic acid (HOTf, 0.1–1 mol%) were performed in water to give alkylated indoles (3a–m) and dialkylsubstituted pyrroles (6a–b) in good to excellent yields.
AbstractN‐Methyl indole reacts with but‐2‐yn‐1‐ol in the presence of PtCl2 in MeOH giving indole derivatives having a substituted 3‐oxobutyl group at the 3‐position in good yield. Under the reaction conditions, various substituted indoles and substituted propargyl alcohols are successfully involved in the reaction giving the corresponding addition products in good to moderate yields. The catalytic reaction can be further extended to N‐phenyl pyrrole. In the present multi‐step reaction, PtCl2 likely plays dual roles: as the catalyst for the rearrangement of propargyl alcohols to the corresponding alkenyl ketones and as the catalyst for the addition of indoles to the alkenyl ketones. Experimental evidence is provided to support the proposed mechanism.
HEGEDUS L. S.; ALLEN G. F.; OLSEN D. J., J. AMER. CHEM. SOC., 1980, 102, NO 10, 3583-3587