routine procedures in pyridine/DMF solvents and with DMAP as the catalyst. Among 20 synthesized compounds, a derivative of 6-methyluracil substituted by the Boc-pyridine moiety at the C5 position appeared unexpectedly. The NMR spectra confirmed the molecular structure of all uracil derivatives. Parallel quantum mechanical DFT calculations supported the experimental findings.
作者:Ling-Xiang Guo、Yu-Han Liu、Li Wang、Meng Wang、Bao-Ping Lin、Hong Yang
DOI:10.1039/c7tc03059b
日期:——
importance but also an interesting scientific research topic. The objective of this work is to screen suitable hydrogen-bonding complementary compounds for the construction of melamine-core supramoleculardiscoticliquidcrystal (LC) materials which might provide a LC perspective for detection and separation of melamine in the future. We design and synthesize five categories of long-alkyl-tailed compounds bearing
Efficient <i>N</i>-Arylation and <i>N</i>-Alkenylation of the Five DNA/RNA Nucleobases
作者:Mikkel F. Jacobsen、Martin M. Knudsen、Kurt V. Gothelf
DOI:10.1021/jo061694i
日期:2006.11.1
[GRAPHICS]A general approach to N-arylation and N-alkenylation of all five DNA/RNA nucleobases at the nitrogen atom normally attached to the sugar moiety in DNA or RNA has been developed. Various protected or masked nucleobases engaged readily in the copper-mediated Chan-Lam-Evans-modified Ullmann condensation with a range of different boronic acids at room temperature and were subsequently converted to the corresponding deprotected or unmasked adducts. Different N-3-protecting groups were examined in the case of thymine, where the benzoyl group afforded the highest yields. A 4-alkylthio-substituted pyrimidin-2(1H)-one served as both a cytosine and a uracil precursor and was N-arylated and N-alkenylated in high yields. Adenine was efficiently and selectively N-arylated and N-alkenylated at the N-9 position by employing a bis-Boc-protected adenine derivative, while a bis-Boc-protected 2-amino-6-chloropurine served as guanine precursor and could also be selectively N-9-arylated and N-9-alkenylated.
Nanoporous Supramolecular Liquid Crystal Polymeric Material for Specific and Selective Uptake of Melamine
作者:Zhen-Zhou Nie、Bo Zuo、Li Liu、Meng Wang、Shuai Huang、Xu-Man Chen、Hong Yang
DOI:10.1021/acs.macromol.0c00322
日期:2020.6.9
nanoporous supramolecular liquid crystal polymericmaterial built on a photo-cross-linked melamine/thymine-derivative supramolecular structure, which can specifically recognize and selectively absorb melamine from solutions. The small pore diameter, specific hydrogen-bonded sites, and strong systematic binding in the hexagonal columnar nanochannels of the supramolecularpolymericmaterial endow itself
A convenient, highly selective and eco-friendly N-Boc protection of pyrimidines under microwave irradiation
作者:Maxime Bessières、Vincent Roy、Luigi A. Agrofoglio
DOI:10.1039/c4ra13033b
日期:——
A novel and practical microwave-assisted, highly selective N3-Boc protection of pyrimidine nucleobases in eco-friendly DEM/EtOH solvent, under mild conditions and moderate to high yield is described.