CN106946735A - Two（4 methoxybenzylidenes）The preparation and use of the diamines of dodecane 1,12 - Google Patents

Abstract

The invention relates to a dodecyl-linked Schiff base dimer compound, which has a colorless microcrystalline appearance, a melting point of 76.8-77.0°C, a molecular formula of C ₂₈ H ₄₀ N ₂ O ₂ , a molecular weight of 436.63, and a chemical name of: (N ¹ E,N ¹² E)‑N ¹ ,N ¹² ‑bis(4‑methoxybenzylidene)dodecane‑1,12‑diamine, the structure of which is as follows: The preparation method of the Schiff base dimer compound is simple, and has strong fluorescence emission between 400-500 nm. The Schiff base dimer compound has mild antitumor activity on lung cancer cells.

Description

Preparation and application of bis(4-methoxybenzylidene)dodecane-1,12-diamine

Technical field:

The invention relates to the fields of organic synthesis, optical materials and medicinal chemistry, and uses relatively simple raw materials and methods to synthesize target products in one step.

Background technique:

Symmetry plays an important role in life activities, so dimers are a ubiquitous structural type in natural products. In the field of material chemistry, dimer structures are often used in the construction of new materials such as optoelectronic materials, supramolecular materials, functional dyes, and fluorescent materials; fluorescent materials based on organic dimer structures are widely used in optical and electronic devices , DNA diagnostics, photochemical sensors, organic pigments, dyes, fluorescent whitening agents, photooxidants, fluorescent coatings, laser dyes, organic electroluminescent devices (ELD) chemical and biochemical analysis, solar collectors, anti-counterfeiting marks, drug tracers and laser and other fields; in the field of medicinal chemistry, dimers often show better activity than corresponding monomers; the design and synthesis of new dimer materials with excellent properties have always been the efforts of materials scientists and medicinal chemists direction.

Schiff base is a compound with a relatively special structure. Different types of Schiff bases can be synthesized according to the different groups introduced; Schiff bases have important applications in the fields of medicine, catalysis, analytical chemistry, corrosion, and photochromism. For example, in the medical field, Schiff base has antibacterial, bactericidal, antitumor, and antiviral biological activities; in the field of optical materials, due to its electron-rich and rigid plane characteristics, it has good fluorescence properties and nonlinear optical properties. Properties; Considering that the connecting chain of the Schiff base dimer itself can have abundant changes, it also has good application prospects in the fields of optical materials and medicinal chemistry.

Contents of the invention

1. Structural characterization

The content of the present invention is that a kind of Schiff base conjugated dimer compound with dodecyl (ie -(CH ₂ ) ₁₂ -) as the connecting chain has been prepared by various methods. The structure of the dimer compound is And related characterization parameters are as follows:

The appearance of the compound is colorless transparent microcrystal, melting point 76.8-77.0℃, molecular formula C ₂₈ H ₄₀ N ₂ O ₂ , molecular weight 436.63, chemical name: (N ¹ E,N ¹² E)-N ¹ ,N ¹² - Bis(4-methoxybenzylidene)dodecane-1,12-diamine, the English system name is: (N ¹ E,N ¹² E)-N ¹ ,N ¹² -bis(4-methoxybenzylidene) dodecane-1,12-diamine, its structure is as follows:

Elemental analysis shows that the percentages of dimer C, H, and N are 77.11%, 9.28%, and 6.46% (theoretical values calculated by the molecular formula C ₂₈ H ₄₀ N ₂ O ₂ are 77.02%, 9.23%, and 6.42%); the relevant ¹ HNMR spectrum and ¹³ CNMR spectrum are shown in Figure 1 and Figure 2 respectively.

2. Synthesis method

The synthesis method of the compound is characterized in that: p-methoxybenzaldehyde and 1,12-dodecyldiamine are used as raw materials, and solution synthesis or solid phase synthesis is adopted. Proceed as follows:

1) Dissolve p-methoxybenzaldehyde and 1,12-dodecyldiamine in suitable organic solvents respectively, then mix them in a certain molar ratio, stir and react at a certain temperature for a certain period of time; Organic solvent, direct mixing of two reactants, grinding reaction.

2) During the liquid phase reaction, remove most of the solvent from the obtained solution by a certain method to obtain powder or crystal, which is the target product; during the solid phase reaction, grind for a certain period of time to obtain the target product.

3) The target product can be recrystallized in a suitable organic solvent to purify the product.

Preferably, the above-mentioned reaction solvent or solvent for recrystallization is selected from methanol, ethyl acetate, dichloromethane, ethanol, acetonitrile, acetone, chloroform, tetrahydrofuran, toluene, and N,N-dimethylformamide.

Preferably, the reaction molar ratio of p-methoxybenzaldehyde and 1,12-dodecyldiamine is 1:2 to 4:1.

Preferably, the reaction temperature is from room temperature to heating to reflux.

Preferably, the reaction time is 0.5-12 hours.

Preferably, the method for removing the solvent is natural volatilization or normal/vacuum distillation.

The beneficial effect of the invention is that relatively complex functional molecular materials can be synthesized in one step with relatively simple steps and reactants, and the separation method is simple.

3. Ultraviolet and fluorescent properties.

Test the ultraviolet spectrum of this compound in 10 ^-5 mol/L ethanol solution, find that it has ultraviolet absorption peak at 208nm and 266nm place, as shown in accompanying drawing 3; Use TD-DFT theory by Gaussian03 software, in b3lyp/6- 311+g(d,p) method/basis set to calculate the ultraviolet spectrum of the compound, the calculated results are listed in Figure 4; it can be found that the calculated spectrum is in good agreement with the experimental results, such as the calculated two main The strong absorption peaks are located at 223nm and 277nm, respectively, which are only 15nm and 11nm different from the experimental results; with the help of orbital analysis, it is found that these two absorption peaks are generated by the π→π* transition.

In 10 ^-5 mol/L ethanol solution, excited by ultraviolet light with wavelengths of 348nm and 366nm respectively, the fluorescence properties of this compound were tested, and it was found that it had strong fluorescence emission between 400-500nm, and the fluorescence spectrum is shown in Figure 5 ; Irradiated by ultraviolet light, blue fluorescence is visible to the naked eye.

4. Antitumor activity in vitro.

Digest the A549 lung cancer cells in the logarithmic phase with 0.25% trypsin to make them single cells, and use F12K culture medium containing 10% fetal bovine serum to make single cells with a concentration of 1.25× ¹⁰⁷ cells/L Suspension, the cells were seeded in a 96-well culture plate, 200 μL per well (2.5×10 ³ cells per well). The 96-well cell culture plate was placed in a CO ₂ incubator at 37°C and 5% CO ₂ for 48 hours.

When the cells in the wells are overgrown (90% full), add different doses of Bencifer base solution (200 μL/well) according to the experimental grouping, so that the final concentrations of the compounds to be tested are 5 μM, 10 μM, 50 μM, 100 μM, 200μM, each group set up 3 duplicate wells, cultured for 96h.

20 μL of MTT at a concentration of 0.5 g/L was added to each well, and culture was continued for 4 hours to reduce MTT to formazan. After all the supernatant was sucked out, 200 μL of DMSO was added to each well and shaken for 15 min to fully dissolve the formazan, and the absorbance (OD value) at 490 nm was measured with an enzyme-linked immunosorbent assay. Then calculate according to the following formula:

Cell inhibition rate%=(OD value of control group-OD value of experimental group)/OD value of control group×100%

The test results showed that the IC50 (half inhibitory concentration of the drug) of the Schiff base on the lung cancer cell A549 was 186.0 μM, which indicated that the compound had a mild inhibitory effect on the lung cancer cell.

detailed description

In order to better understand the content of the present invention, the technical solution of the present invention is further described below through a specific embodiment:

Example 1.

Weigh 1.36g (0.01mol) of p-methoxybenzaldehyde and dissolve it in 30mL of absolute ethanol, heat and stir until completely dissolved, add 1.00g (0.005mol) of 1,12-dodecyldiamine, and heat to reflux under stirring After cooling to room temperature for 6 hours, filter the filtrate and place the filtrate in a beaker to stand still for volatilization. A large amount of crystal-like precipitates can be obtained. After filtering the resulting precipitates, the initial product can be obtained. This initial product can be recrystallized with methanol to obtain colorless powder crystals, namely target product.

Example 2.

Weigh 1.36g (0.01mol) of p-methoxybenzaldehyde, add 1.00g (0.005mol) of 1,12-dodecyldiamine, and grind for 8 hours at room temperature to obtain a paste, then add 20ml of absolute ethanol , heated to dissolve, and after cooling, a colorless powder crystal is obtained, which is the target product, and recrystallization can purify the product.

Description of drawings

Accompanying drawing 1 is the ¹ H NMR spectrogram of the target compound.

Accompanying drawing 2 is the ¹³ CNMR spectrogram of target compound.

Accompanying drawing 3 is the ultraviolet spectrogram (experimental result) of target compound.

Accompanying drawing 4 is the ultraviolet spectrogram (Gaussian 03 calculation result) of target compound.

Accompanying drawing 5 is the fluorescence spectrogram (experimental result) of target compound.

Claims (3)

1. A dodecyl-linked Schiff base dimer compound, which is colorless crystallite in appearance, with a melting point of 76.8-77.0°C, a molecular formula of C ₂₈ H ₄₀ N ₂ O ₂ , a molecular weight of 436.63, and a chemical name of : (N ¹ E,N ¹² E)-N ¹ ,N ¹² -bis(4-methoxybenzylidene)dodecane-1,12-diamine, its structure is as follows: 2. As claimed in claim 1, the compound is used in optical electronic devices, DNA diagnosis, photochemical sensors, organic pigments, dyes, fluorescent whitening agents, photooxidants, fluorescent coatings, laser dyes, organic electroluminescent devices, chemical and biochemical analysis , solar collectors, anti-counterfeiting markers, drug tracers and uses in the field of lasers, which are based on their fluorescent properties. 3. The use of the compound as claimed in claim 1 or a pharmaceutically acceptable salt thereof in the preparation of a drug for the prevention and/or treatment of tumors, characterized in that: the tumor is lung cancer.