Synthesis and biological activity of the 2-amino-4-(4-iodophenyl)amino-6-methylpyrimidine isosteric analogs
摘要:
Transformation of the structure of 6-methylisocytosine results in the isosteric analogs of 2-amino-4-(4-iodophenyl)amino-6-methylpyrimidine exhibiting tuberculocidal properties. The level of biological activity of the synthesized compounds depends on the site of location of the halogen atom.
rown-10 moiety is connected to the hydrogen-bonding moiety, and two acceptor-assembling monomers, 2 and 3, in which the electron-deficient pyromellitic diimide or naphthalene diimide group is incorporated, respectively, are synthesized and characterized. 1H NMR and 2D-NOESY studies show that all these compounds exist as stable homodimers in chloroform. Mixing 1 equiv of 1 with 1 equiv of 2 in chloroform
A method and therapeutic compositions for inducing interferon formation in vivo. To a host is administered an interferon inducer of the formula: ##SPC1## Wherein X is a member selected from the group consisting of bromo and iodo and Y is a member selected from the group consisting of methyl and ethyl when X is bromo; or Y is a member selected from the group consisting of methyl, ethyl, n-propyl, benzyl and chloro when X is iodo.
This paper describes the self-assembly of a new series of heterotrimers in chloroform-d by utilizing the cooperative interaction of hydrogen bonding and donor-acceptor interaction. Compounds 1 and 11, in which an 2-ureido-4[1H]-pyrimidinone unit is connected to 34-crown-10 or 36-crown-10, were used as donor monomer, and 2 and 19, in which an 2-ureido-4[1H]-pyrimidinone unit is connected to NDI, were used as acceptor monomer, while linear compound 4, which contains two diamido-1,8-naphthyridines, was used as template. A large tri-p-(t-butyl)phenylmethoxyl group was introduced to 19 in order to compare its assembling behavior with that of 2. Mixing 4 with dimer 1 (.) 2 caused 1 (.) 2 to fully decompose and to afford 55% of 'in-in'-oriented heterotrimer 1 (.) 4 (.) 2. Adding 4 to the solution of 2 (.) 11 or 11 (.) 19 in chloroform-d also led to full dissociation of the dimers. However, in these systems the 'in-in'-arranged heterotrimer 2 (.) 4 (.) 11 or 11 (.) 4 (.) 19 could be produced exclusively. (c) 2005 Elsevier Ltd. All rights reserved.
H-Bonded Supramolecular Polymer for the Selective Dispersion and Subsequent Release of Large-Diameter Semiconducting Single-Walled Carbon Nanotubes
作者:Igor Pochorovski、Huiliang Wang、Jeremy I. Feldblyum、Xiaodong Zhang、Alexander L. Antaris、Zhenan Bao
DOI:10.1021/jacs.5b01704
日期:2015.4.8
Semiconducting, single-walled carbon nanotubes (SWNTs) are promising candidates for applications in thin-film transistors, solar cells, and biological imaging. To harness their full potential, however, it is necessary to separate the semiconducting from the metallic SWNTs present in the as-synthesized SWNT mixture. While various polymers are able to selectively disperse semiconducting SWNTs, the subsequent removal of the polymer is challenging. However, many applications require semiconducting SWNTs in their pure form. Toward this goal, we have designed a 2-ureido-6[1H]-pyrimidinone (UPy)-based H-bonded supramolecular polymer that can selectively disperse semiconducting SWNTs. The dispersion purity is inversely related to the dispersion yield. In contrast to conventional polymers, the polymer described herein was shown to disassemble into monomeric units upon addition of an H-bond-disrupting agent, enabling isolation of dispersant-free, semiconducting SWNTs.