Synthesis of selectively protected polyaza macrocycles
摘要:
A general route to selectively protected polyaza macrocycles has been developed using a mixture of diethylphosphoryl and tosyl groups for protection of linear chain polyamines. Condensation of N-(diethoxy-phosphoryl)-N',N''-ditosydiethylenetriamine (1a), N,N''-bis(diethoxyphosphoryl)-N'-tosyldiethylenetriamine (1b) and N,N',N''-tri(diethoxyphosphoryl)diethylenetriamine (1c) with mesylates or tosylates 2 gave the corresponding macrocycles 3 in reasonable yield. The phosphoryl group was selectively removed with gaseous HCl in excellent yield.
Face-to-face stacking in sulfonamide based bis-ethylene bridged heteroaromatic dimers
作者:Ranjeet Kumar、Sunil K. Rai、Praveen Singh、Archana Gaurav、Pratima Yadav、Ranjana S. Khanna、Hariom Gupta、Ashish K. Tewari
DOI:10.1039/c5ra12230a
日期:——
sulfonamide based bis-ethylene bridged heteroaromatic dimers were synthesized for analysis of their structural and conformational properties. Interestingly, all models showed intramolecular offset face-to-face stacking between the tosyl group and heteroaromatic system in their solidstateconformations. 1H NMR of the solutions revealed that the conformations were not far off from the solidstate stacked
合成了四个基于磺酰胺的双乙烯桥杂芳族二聚体,用于分析其结构和构象性质。有趣的是,所有模型均显示了处于固态构型的甲苯磺酰基和杂芳族体系之间的分子内错位面对面堆积。溶液的1 H NMR显示构象与固态堆叠的几何形状相距不远。然而,不同构象异构体的气态优化表明晶体结构是最低能量的构象异构体。
A new receptor with a FRET based fluorescence response for selective recognition of fumaric and maleic acids in aqueous medium
作者:Upendar Reddy G.、Rabindranath Lo、Sovan Roy、Tanmay Banerjee、Bishwajit Ganguly、Amitava Das
DOI:10.1039/c3cc45051a
日期:——
Preferential binding of a new reagent to fumaric acid could be utilized for its estimation in aqueous medium and in commercial fruit juice.
<i>N</i>-(ω-TOSYLOXYALKYL)PHTHALIMIDES AS REACTIVE GENERAL SYNTHONS FOR INTRODUCING ALKYLAMINO GROUPS AND THEIR APPLICATION FOR THE “SELF-PROLIFERATIVE” SYNTHESIS OF OPEN-CHAIN POLYAMINES
作者:Masaaki Iwata、Hiroyoshi Kuzuhara
DOI:10.1246/cl.1986.369
日期:1986.3.5
New synthetic routes to N-(ω-tosyloxyalkyl)phthalimides (2) were developed and the synthetic utility of 2 as alkylating reagents was exemplified in the open-chain polyamine synthesis involving the ...