Synthesis of New C2- Symmetric Fluoren-9-ylidene Malonate Derived Bis(oxazoline) Ligands and Their Application in Friedel-Crafts Reactions
作者:Jing Li、Hong-Liang Chen、Lei Liu、Bin Fu
DOI:10.3390/molecules15128582
日期:——
series of new C(2)-symmetric fluoren-9-ylidene malonate-derived bis(oxazoline) ligands were synthesized from fluoren-9-ylidene malonate and enantiomerically pure amino alcohols via a convenient route. Their asymmetric catalytic properties in the Friedel-Crafts reactions of indoles with arylidene malonates were evaluated, and the Cu(OTf)2 complex of a fluoren-9-ylidene malonate-derived bis(oxazoline) bearing
A highly efficient enantioselective Friedel-Crafts alkylation of indoles with alkylidene malonates has been developed using chiral N,N'-dioxide LA-scandium(III) complex as the catalyst, giving the corresponding products in high yields with excellent enantioselectivities (up to 99% yield and 95% ee). The product 3a was facilely converted into several interesting compounds, such as tryptamines, indolepropionic acids and beta-carbolines. It is noteworthy that the seven-membered beta-carboline-like compound has been synthesized for the first time. Based on the crystal structure of the chiral N,N'-dioxide L10-scandium(III) complex, the proposed transition state and possible catalytic cycle were presented to elucidate the reaction mechanism. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of heteroarylidene malonate derived bis(thiazolines) and their application in the catalyzed Friedel–Crafts reaction
作者:Lei Liu、Jing Li、Mingan Wang、Fengpei Du、Zhaohai Qin、Bin Fu
DOI:10.1016/j.tetasy.2011.03.003
日期:2011.3
A series of novel heteroarylidene malonate derived bis(thiazoline) ligands 1 and 2 were synthesized and applied to a Friedel-Crafts reaction between indole and alkylidene malonate. The Cu(OTf)(2) complex of ligand 2b bearing a benzyl group afforded moderate to excellent enantioselectivity for the adducts (up to >99% ee). (C) 2011 Elsevier Ltd. All rights reserved.
Cu(OTf)<sub>2</sub>-Catalyzed Asymmetric Friedel–Crafts Alkylation Reaction of Indoles with Arylidene Malonates Using Bis(sulfonamide)-Diamine Ligands
作者:Jing Wu、Dongping Wang、Fan Wu、Boshun Wan
DOI:10.1021/jo400747d
日期:2013.6.7
highly efficient Cu-catalyzed asymmetric Friedel Crafts alkylation reaction of indoles with arylidene malonates using simple, stable, and easily prepared bis-sulfonamide diamine ligands was developed. The desired products were obtained in up to 99% yield with 96% ee.