Lewis acid-mediated mono- and bis-addition of C -nucleophiles to 1,3-dioxolan-4-ones
摘要:
The reactions of 1,3-dioxolan-4-ones, readily available from a-hydroxy acids and aldehydes, with C-nucleophiles are described. Two possible reaction pathways resulting in O-substituted acids and tri-(hetero)arylmethanes are shown. (C) 2018 Elsevier Ltd. All rights reserved.
The first highly efficient double Friedel–Crafts reaction of N-tosyl imines with anisole, phenol, thioanisole and analogues has been developed to produce the corresponding symmetric diarylmethanes and triarylmethanes with high regioselectivity in the presence of a catalytic amount of Bi2(SO4)3–TMSCl at room temperature.
synthesizing the target molecules. The perfect chemoselectivity between aromatic and aliphatic aldehydes is difficult to achieve by the previous methods. The aromatic aldehyde-selective nucleophilic addition in the presence of aliphatic aldehydes was newly accomplished. Namely, the aromatic aldehyde-selective nucleophilic addition using arenes and allyl silanes proceeded in the presence of trialkylsilyl
Efficient Condensation Reactions of Electron-Rich Arenes with Aldehydes and Enals Promoted by Gold(III) Chloride: Practical Synthesis of Triaryl- and Triheteroarylmethanes and Related Compounds
作者:Vijay Nair、N. Vidya、K. Abhilash
DOI:10.1055/s-2006-950209
日期:2006.11
Electron-rich arenes undergo gold(III) catalyzed condensation reactions with aldehydes and enals to afford bis- and tris-addition products, respectively, in high yields.
Tris(pentafluorophenyl)borane [B(C6F5)3] has been used as an efficient catalyst for reductive alkylation of alkoxy benzenesusing aldehydes as an alkylating agent in the presence of polymethylhydrosiloxane (PMHS). Various alkylated trimethoxybenzene derivatives have been prepared in good to high yields. In addition, B(C6F5)3 was also used as a catalyst for the reaction of electron-rich arenes with aldehydes
三(五氟苯基)硼烷[B(C 6 F 5)3 ]已被用作在聚甲基氢硅氧烷(PMHS)存在下使用醛作为烷基化剂的烷氧基苯还原烷基化的有效催化剂。各种烷基化的三甲氧基苯衍生物已经以高到高的产率制备。另外,B(C 6 F 5)3也用作富电子芳烃与醛反应以获得三芳基甲烷的催化剂。还已经证明了使用还原烷基化方案合成异色满和四氢异喹啉衍生物。
A rapid, highly efficient, and general protocol for the synthesis of functionalized triarylmethanes: a straightforward access for the synthesis of (−)-tatarinoid C
作者:B. Madhu Babu、Pramod B. Thakur、N. Nageswara Rao、G. Santosh Kumar、H.M. Meshram
DOI:10.1016/j.tetlet.2014.01.107
日期:2014.3
functionalized triarylmethane is described by the Friedel–Crafts alkylation of methoxybenzenes with a variety of aldehydes in the presence of BF3·OEt2. The generality of the method is demonstrated by screening a variety of di- or tri-substituted arenes as well as substituted aromatic, heteroaromatic, and aliphatic aldehydes. (−)-Tatarinoid C is synthesized in a single step following the same protocol.