Data on the synthesis and characterization of two novel polydentate ligands possessing unsymmetrical NH–urea fragment

The data represent the synthesis and structural characterization of two novel polydentate ligands possessing unsymmetrical NH-urea fragment: an open-chain substituted aromatic compound with unsymmetrical urea and secondary amine units (S1) and fused aryloxazinone with unsymmetrical urea fragment (S2). The data include the analyzed NMR spectra, turbo-spray mass spectra, melting points and Rf-values. 1D and 2D NMR spectra are given in the article. The efficiency of the ligands as synergists in the isolation and separation of lantanoid ions is reported in rerence. [1].


a b s t r a c t
The data represent the synthesis and structural characterization of two novel polydentate ligands possessing unsymmetrical NH-urea fragment: an open-chain substituted aromatic compound with unsymmetrical urea and secondary amine units (S1) and fused aryloxazinone with unsymmetrical urea fragment (S2). The data include the analyzed NMR spectra, turbo-spray mass spectra, melting points and R f -values. 1D and 2D NMR spectra are given in the article. The efficiency of the ligands as synergists in the isolation and separation of lantanoid ions is reported in rerence. [1].
& The data are available within this article and present a supplementary material to the article "M. Atanassova, S. Todorova, V. Kurteva, N. Todorova, Insights into the synergistic selectivity of 4f-ions implementing 4-acyl-5-pyrazolone and two new unsymmetrical NH-urea ring molecules in an ionic liquid, Sep. Purif. Technol.; In preparation" [1].

Value of the data
The 2D NMR data permit full assignment of the signals in the spectra of the novel compounds. The ligands offer unlimited possibilities for NH-derivatization. The data can be useful for comparison with similar structures.

Data
The data include synthetic details and characterization by 1D and 2D NMR spectra, mass spectrometry, TLC and m.p. of novel organic polydentate ligands.

General
All reagents were purchased from Aldrich, Merck and Fluka and were used without further purification. The deuterated chloroform was purchased from Deutero GmbH. Fluka silica gel (TLC-cards 60778 with fluorescent indicator 254 nm) were used for TLC chromatography and R f -values determination. Merck Silica gel 60 (0.040-0.063 mm) was used for flash chromatography purification of the products. The melting points were determined in capillary tubes on SRS MPA100 OptiMelt (Sunnyvale, CA, USA) automated melting point system. The NMR spectra were recorded on a Bruker Avance IIþ 600 spectrometer (Rheinstetten, Germany) in CDCl 3 ; the chemical shifts were quoted in ppm in δ-values against tetramethylsilane (TMS) as an internal standard and the coupling constants were calculated in Hz. The spectra were processed with Topspin 2.1 program. The low-resolution mass spectra were taken on a HP 5973 Mass Selective Detector, the turbo spray spectrum on API 150EX (AB/MAS Sciex). Scheme 1. Synthesis of the ligands S1 and S2.

Synthesis and characterization
Two novel polydentate ligands possessing unsymmetrical NH-urea fragment, S1 and S2 (Scheme 1) were synthesized as a mixture from a known bis-amine [2] and were isolated in low overall yield by flash chromatography on silica gel [3]. The optimization of protocols for each ligand is in progress.
To a solution of 2,6-bis((benzylamino)methyl)-4-methylphenol (3.92 mmol, 1.359 g), pyridine (12 mmol, 0.97 ml), and aniline (6 mmol, 0.55 ml) in toluene (20 ml) phosgene (8 mmol, 3.96 ml 20% solution in toluene) was added and the mixture was stirred at room temperature for 24 h. The products were partitioned between toluene and 10% aq. HCl. The water layer was washed with dichloromethane (DCM). The combined organic solutions were dried over MgSO 4 , evaporated to dryness, and purified by flash chromatography on silica gel by using mobile phase with a gradient of polarity from DCM to 2% MeOH in DCM.

Transparency document. Supporting information
Transparency data associated with this article can be found in the online version at http://dx.doi. org/10.1016/j.dib.2018.08.136.