Synthesis of linked 1,3,5-triaroylbenzenes via enamine-directed alkyne cyclotrimerization
摘要:
Triaroylbenzenes connected via m-xylyl, p-xylyl, 4,4'-biphenyl, and 1,3,5-benzenetriyl linking units have been prepared in good yield by condensation of bis(enaminones) with aryl ethynyl ketones, The required bis(enaminones) were conveniently prepared starting from the corresponding bis- or tris(halomethyl) linking units and 3-hydroxybenzaldehyde. (C) 2000 Elsevier Science Ltd. All rights reserved.
通过在Ac 2 O介质中回流环化双硫氨基甲唑酮(3a,3b,3c,3d,3e,3e,3f,3g),合成了二噻唑啉(4a,4b,4c,4d,4e,4f,4g)。中间体是从二苯甲醛(2a,2b,2c,2d,2e,2f,2g)在干燥的EtOH / HCl存在下通过回流与thiosemicarbazide一起使用。后者是在碱性条件下,由3-羟基苯甲醛与合适的二溴衍生物进行O-烷基化制得的,收率很高。通过严格分析其光谱参数(UV-vis,IR,1 H NMR,13 C NMR和ESI-MS)来确定所制备化合物的结构。使用连续管稀释法筛选了新制备的化合物对七种细菌和五种真菌菌株的抗菌活性。
A New Route to Hyperbranched Macromolecules: Syntheses of Photosensitive Poly(aroylarylene)s via 1,3,5-Regioselective Polycyclotrimerization of Bis(aroylacetylene)s
作者:Hongchen Dong、Ronghua Zheng、Jacky W. Y. Lam、Matthias Häussler、Anjun Qin、Ben Zhong Tang
DOI:10.1021/ma050342v
日期:2005.7.26
A new synthetic route to hyperbranched polymers is developed. Polycyclotrimerizations of functional diynes 1−3 initiated by a simple base of piperidine lead to the formation of hyperbranchedpoly(aroylarylene)s P1−P3 with perfect 1,3,5-regioregularity and high degree of branching (up to 100%) in high yields (up to 99%). The polymers show high photosensitivities and can be readily photo-cross-linked
Multicomponent synthesis of dihydropyridines catalyzed by l-proline
作者:Leila Zare、Mohammad Nikpassand
DOI:10.1016/j.cclet.2010.12.012
日期:2011.5
Abstract Multicomponent synthesis of mono and bis 4-substituted-1,4-dihydropyridines from aldehydes, dimedone and ammonium acetate in the presence of an efficient recyclable catalyst, l -proline, in high yield and short reaction time is reported.
Self-assembly of molecular devices containing a ferrocene, a porphyrin and a quinone in a triple macrocyclic architecture
作者:Richard W. Wagner、Philip A. Brown、Thomas E. Johnson、Jonathan S. Lindsey
DOI:10.1039/c39910001463
日期:——
Porphyrinogen self-assembly is compatible with a structurally diverse set of meta-linked dialdehyde building blocks, providing rapid access under gentle conditions to porphyrins bearing redox-active units positioned in a 3-dimensional architecture.
An Enaminone-Directed Benzannulation/Macrocyclization Approach to Cyclophane Ring Systems
作者:F. Christopher Pigge、Fatemeh Ghasedi、Nigam P. Rath
DOI:10.1021/jo0256181
日期:2002.6.1
A straightforward and modular preparative approach to 1,3,5-triaroylbenzene-based functionalized cyclophane ring systems has been developed. The key cyclophane-forming macrocyclization reaction was accomplished during the course of a regioselective cross-benzannulation between bis(aryl ethynyl) ketone and enaminone reactants. Macrocyclic products with ring sizes ranging from 18-to 22-membered were successfully constructed. The composition of the tether connecting the two aryl ethynyl ketone fragments can be easily varied; consequently, this method is suitable for construction of a diverse range of structurally distinct cyclophane products. To illustrate this feature, cyclophanes possessing xylyl, alkyl, di(ethylene triamine), and di(ethylene oxy) bridging units were synthesized in isolated yields of 11-46%. Three new cyclophanes (calixarene-like macrocyles 8 and 9, as well as crownophane 18) were structurally characterized by X-ray diffractometry.