这里报道的是通过定制反应模块对联苯[ n ]芳烃形成的综合研究。通过具有不同多甲氧基苯基反应模块的单体与多聚甲醛缩合合成了五种新的大环芳烃和四种低聚物。我们证明了反应模块上甲氧基的数量和位点极大地影响了大环的反应活性、形状和连接方式。此外,单晶结构揭示了大环的三角形和马鞍形构型。该结果为设计新的大环芳烃提供了典型和基本的指导。
Synthesis of 1,2,4-Trimethoxybenzene and Its Selective Functionalization at C-3 by Directed Metalation
摘要:
A new and efficient strategy was developed for the preparation of 1,2,4-trimethoxybenzene (3, a powerful attractant of Euglossini bees) and its C-3 derivatives (7a-j), from vanillin (2) in 56% overall yield.
Process for the preparation of 5-(substituted)-10 methoxy-2,2,4-trimethyl-2,5-dihydro-
1H-chromeno [3,4-f] quinolines and derivatives thereof
申请人:——
公开号:US20030069427A1
公开(公告)日:2003-04-10
The present invention relates to an efficient process for the preparation of 5-(substituted)-10-methoxy-2,2,4-trimethyl-2,5-dihydro-1H-chromeno[3,4-f]quinolines.
Convergent synthesis of 2H-chromenes—a formal [3+3] cycloaddition by a one-pot, three-step cascade
作者:Kathlyn A. Parker、Thomas L. Mindt
DOI:10.1016/j.tet.2011.09.068
日期:2011.12
In cases in which the palladium-catalyzed coupling of a bromoquinone with a vinyl stannane affords a vinyl quinone that enolizes, the resulting ortho-quinone methide undergoes an oxa-6 pi electrocyclization. Enolization is promoted by the presence of a polar additive. The net conversion is a formal [3+3] cycloaddition that gives 2H-chromenes. Because the first two steps of the cascade are catalyzed, the overall conversion is an example of multicatalysis. Yields for the optimized, one-pot protocol are dramatically improved over the conventional stepwise process. (C) 2011 Elsevier Ltd. All rights reserved.
Pd(II)-catalyzed bromo- and chlorodecarboxylation of electron-rich arenecarboxylic acids
作者:Xuefeng Peng、Xiang-Feng Shao、Zhong-Quan Liu
DOI:10.1016/j.tetlet.2013.03.135
日期:2013.6
A bromo- and chlorodecarboxylation of various aromatic carboxylic acids catalyzed by Pd(II) has been developed in this work. A series of electron-rich arenecarboxylic acids gave the corresponding decarboxylative monohalogenation products under the typical reaction conditions. (C) 2013 Elsevier Ltd. All rights reserved.