已开发出一种用于将多种简单和杂环芳烃与芳基碘化物、溴化物和氯化物进行分子内直接芳基化的催化剂。这些反应以极好的收率发生并且具有高度选择性。对芳基碘化物底物的研究表明,由于碘化物在反应介质中的积累,会发生催化剂中毒。这可以通过添加银盐来克服,银盐也允许这些反应在较低温度下发生。该方法的效用通过咔唑天然产物的快速合成和通过直接芳基化产物的开环反应合成空间位阻四邻位取代的联芳基来说明。机理研究提供了对催化剂的深入了解 s 作用模式并显示在钯催化的简单芳烃的直接芳基化中存在动力学上显着的 CH 键裂解。从这些研究中获得的知识导致了以前无法获得的芳烃的新分子间芳基化反应的发展,为其他新的直接芳基化过程的发展打开了大门。
Synthesis of furo[2,3-c]quinolinones via intramolecular C(3)–H arylation of furan core under Pd/NHC-catalysis
作者:Konstantin E. Shepelenko、Irina G. Gnatiuk、Mikhail E. Minyaev、Victor M. Chernyshev
DOI:10.1016/j.mencom.2024.02.012
日期:2024.3
An efficient procedure for the preparation of furo[2,3-]-quinolin-4(5)-ones from 2-furoic acid -(-bromoaryl)- amides selective intramolecular C(3)–Harylation of the furan nucleus involves the catalysis by a Pd/NHC system generated from Pd(OAc) and readily available IPr HCl proligand. A series of novel furo[2,3-]quinolin-4(5)-ones were prepared in 65–80% isolated yields.
Farcasan; Makkay, Academia Republicii Populare Romine, Filiala Cluj, Studii si Cercetari de Chimie, 1957, vol. 8, p. 363,366
作者:Farcasan、Makkay
DOI:——
日期:——
Candida antarctica lipase A in the dynamic resolution of novel furylbenzotiazol-based cyanohydrin acetates
作者:Csaba Paizs、Monica Toşa、Cornelia Majdik、Petri Tähtinen、Florin Dan Irimie、Liisa T. Kanerva
DOI:10.1016/s0957-4166(03)00025-9
日期:2003.3
A series of novel (R)-furylbenzotiazol-based cyanohydrin acetates were prepared in over 90% isolated yields from the corresponding furancarbaldehydes. The one-pot method combines a basic resin to produce hydrogen cyanide from acetone cyanohydrin, an equilibrium between the formation and decomposition of furylbenzotiazol-based cyanohydrins and the unique enantioselectivity of Candida antarctica lipase A, allowing the acylation of (R)-cyanohydrins in the presence of vinyl acetate in anhydrous acetonitrile. (C) 2003 Elsevier Science Ltd. All rights reserved.
Bezbarua, Maitreyee Sarma; Kataky, Indian Journal of Heterocyclic Chemistry, 2014, vol. 23, # 4, p. 425 - 428