Lanthanum(III) Trifluoromethanesulfonate Catalyzed Direct Synthesis of Ureas from N-Benzyloxycarbonyl-, N-Allyloxycarbonyl-, and N-2,2,2-Trichloroethoxycarbonyl-Protected Amines
作者:Hee-Kwon Kim、Tien Tan Bui
DOI:10.1055/s-0040-1707991
日期:2020.6
A novel lanthanum triflate mediated conversion of N-benzyloxycarbonyl-, N-allyloxycarbonyl-, and N-trichloroethoxycarbonyl-protected amines into nonsymmetric ureas was discovered. In this study, lanthanum triflate was found to be an effective catalyst for preparing various nonsymmetric ureas from protected amines. A variety of protected aromatic and aliphatic carbamates reacted readily with various
Preparation of derivatives of amidineurea and their reactions
作者:B. Skowrońska-Serafin、T. Urbański
DOI:10.1016/0040-4020(60)85002-8
日期:1960.1
A new method for preparing 1-amidine-3-arylureas or-3-alkylureas (I) from aryl or alkyl amine and cyanoguanidine or by hydrolysis of corresponding aryl or alkyl biguanides is described. The reaction of salts of amidineureas with primary or secondary amines to yield substituted ureas is described.
‘Frustrated’ hydrogen-bonded self-associated systems as templates towards DNA incorporated nanostructure formation
作者:Tamrin L. Gumbs、Lisa J. White、Neil J. Wells、Helena J. Shepherd、Jennifer R. Hiscock
DOI:10.1080/10610278.2017.1351613
日期:2018.4.3
synthesis of a thymine nucleobase-appended ‘frustrated’ monomer, which exhibits self-association in DMSO solutions through the formation of hydrogen bonds. This self-association process has been explored in both competitive DMSO solutions and the solidstate, using a combination of NMR and single crystal X-ray diffraction techniques. The self-associative equilibria within the solution state are balanced
摘要在此,我们介绍了胸腺嘧啶核碱基附加的“受阻”单体的合成,该单体通过形成氢键在 DMSO 溶液中表现出自缔合。使用 NMR 和单晶 X 射线衍射技术的组合,已在竞争性 DMSO 溶液和固态中探索了这种自缔合过程。溶液状态内的自缔合平衡以这样的方式平衡,即单体结构中存在的提供和接受胸腺嘧啶残基的氢键可以自由地协调其他客体物种,例如互补的 DNA 碱基腺嘌呤。腺嘌呤模拟物 2-氨基吡啶和 2,6-二氨基吡啶已被用于探索这些自相关结构对互补 DNA 碱基对的协调的潜力。
Substituted Urea Derivatives: A Potent Class of Antidepressant Agents
作者:Shahnaz Perveen、Sana Mustafa、Muhammad A. Khan、Ahsana Dar、Khalid M. Khan、Wolfgang Voelter
DOI:10.2174/157340612800786615
日期:2012.5.1
A series of fourteen (14) N-nitrophenyl-N'-(alkyl/aryl)urea and symmetrical 1,3-disubstituted urea derivatives were synthesized and evaluated for their antidepressant activity in mice. Among them, N-(4-nitrophenyl)-N'-(1'-phenylethyl)urea (1), demonstrated profound antidepressant property as reflected by significant reduction in the immobility time (89.83%), whereas compounds 2-6 showed activity values
A concise and efficient method to construct 8-azaguanines derivatives by the rapid assembly of EDA and carbodiimides via a cascade cyclization process has been developed. A variety of diversely substituted 8-azaguanines derivatives were prepared with excellent regioselectivity and good yields utilizing two same or different carbodiimides.