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                            The BI-3802 was designed by Boehringer Ingelheim and could be obtained free of charge through the Boehringer Ingelheim open innovation portal opnMe.com, associated with its negative control.
 
                
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Seungil Kim ; Kamil W. Nowicki ; Keishi Kohyama ; Aditya Mittal ; Sangho Ye ; Kai Wang , et al.
Abstract: Cerebral aneurysms are a source of neurological morbidity and mortality, most often as a result of rupture. The most common approach for treating aneurysms involves endovascular embolization using nonbiodegradable medical devices, such as coils. However, the need for retreatment due to the recanalization of coil-treated aneurysms highlights the importance of exploring alternative solutions. In this study, we propose an injectable extracellular matrix derived embolic formed in situ by Michael addition of gelatin-thiol (Gel-SH) and hyaluronic acid vinyl (HA-VS) that may be delivered with a therapeutic agent (here, RADA-SP) to fill and remodel aneurysmal tissue without leaving behind permanent foreign bodies. The injectable embolic material demonstrated rapid gelation under physiological conditions, forming a highly porous structure and allowing for cellular infiltration. The injectable embolic exhibited thrombogenic behavior in vitro that was comparable to that of alginate injectables. Furthermore, in vivo studies in a murine carotid aneurysm model demonstrated the successful embolization of a saccular aneurysm and extensive cellular infiltration both with and without RADA-SP at 3 weeks, with some evidence of increased vascular or fibrosis markers with RADA-SP incorporation. The results indicate that the developed embolic has inherent potential for acutely filling cerebrovascular aneurysms and encouraging the cellular infiltration that would be necessary for stable, chronic remodeling.
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                        | CAS No. : | 15441-06-2 | 
| Formula : | C8H14O4S2 | 
| M.W : | 238.32 | 
| SMILES Code : | O=C(OC)CCSSCCC(OC)=O | 
| MDL No. : | MFCD00128218 | 
| InChI Key : | OSZKBWPMEPEYFU-UHFFFAOYSA-N | 
| Pubchem ID : | 84913 | 
| GHS Pictogram: |   | 
| Signal Word: | Warning | 
| Hazard Statements: | H302-H315-H319-H335 | 
| Precautionary Statements: | P261-P305+P351+P338 | 
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.

| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 89.3% | In a 500ml three neck flask equipped with a stirrer, a condenser and a thermometer, 200ml 10 percent (percentage by weight, hereinafter is the same)NaHCO3 solution and 21.7g(0.25mol) methyl acrylate were added sequentially, then the system was cooled to -5-10°C. Keeping under the temperature, a cooling sodium polysulphide (0.19 mol, counted by Na2S) solution was dropped during 0.5-2 hours. After the dropwise addition, ice water bath was removed. The mixture was left standing under the room temperature for 5-6 hours. Then the reaction was over. The obtained mixture was allowed to stand and separate into two layers. The water layer was removed. A 120ml (1 mol / L) Na2SO3 solution was added to the oil layer. The mixture then reacted continuously for 2-5 hours under the temperature of 50°C until the reaction was over. The resulting mixture was again allowed to stand and separate into layers. Then the water layer was removed, and the oil layer was washed with water. 26.8g light yellow oily substance was obtained by vacuum distilling, the yield is 89.3percent, the boiling point is 182-185°C / 7mmHg. | |
| With hydrogen sulfide; sulfur; methylamine; In water; at 15 - 25℃; | 129 g (1.5 moles) of methyl acrylate was added to a 1 L four-necked flask equipped with a thermometer and a stirrer,40percent methylamine aqueous solution 5.2g, sulfur 90g, temperature control 15-25 30.1g hydrogen sulfide gas,To give a pale yellow reaction mixture; | 
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 97% | With sodium sulfite; In water; at 10℃; for 24h;Inert atmosphere;Product distribution / selectivity; | Example 24; Into a 4-necked 8 L flask equipped with an agitator, a thermometer, a gas dispersion tube, a nitrogen purging adapter, and a cooling jacket, 3,3'-dithioproionic acid methyl ester (944 g, 4 mol) was introduced. As the reaction solvent, 1000 g of water was introduced. 30 g of sodium sulfite (Na2SO3) was introduced, and the mixture was agitated to dissolve it. While maintaining the reaction temperature at 10° C., monomethylamine (99percent, 378 g, 12 mol) was added through the gas dispersion tube over about 4 hours. After completing introduction of monomethylamine, the mixture was stirred for 20 hours, and stirred while maintaining the inside temperature at 10° C. to complete the reaction. At this time, excessive monomethylamine and formed methanol were distilled and removed under vacuum. To crystallize the produced DDDA, the temperature of the reaction solution was lowered to 0° C., and then it was stirred for 100 minutes. To filter the formed solid, the solid was dehydrated using a laboratory centrifugal filter (r=0.4 m, rpm=1700). Subsequently, the dehydrated solid was completely dried using a vacuum oven drier, and then the final weight was measured. The content of remaining MMAP impurity in the dried DDDA was quantitatively analyzed and the result is described in the following Table 5. | 
| In methanol; at 5 - 15℃; for 24h; | The above reaction mixture was added with 100 g of methanol and 55 g (1.77 mol) of methylamine gas was added under stirring at a temperature of 5-15 ° C,Add insulation for 24 hours,To give a methanol suspension of N, N'-dimethyl-3,3'-dithiodipropionamide.Steam distillation at least atmospheric distillation of methanol, evaporated to no liquid and then vacuum distillation, until the kettle temperature reached 70 , the pressure reached -0.09Mpa not flow so far;Kettle by adding ethyl acetate 150g, continue to distillation to the kettle temperature to 80 , the pressure reached -0.09Mpa no flow so far,Then, 300 g of ethyl acetate was added to the kettle to form a suspension of the amidated product in ethyl acetate; | 
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| With chlorine; In n-heptane; | EXAMPLE II Preparation of Dimethyl 3,3'-Dithiodipropionate To a 2-liter, 3-necked, jacketed glass flask fitted with a stirrer, reflux consenser, a thermowell, a fritted glass bubbler for charging chlorine, and a stopcock in the bottom was charged 1000 milliliters of n-heptane and 240 grams (2.0 moles) of methyl 3-mercapto propionate. Chlorine gas (0.104 moles, 74 grams) was passed into the vigorously stirred reaction mixture from a continuously weighed cylinder over about a 30 minute period. The reaction temperature increased from about 20 C. initially to about 45 C. measured at the end of the chlorination period. In addition, the reaction solution became cloudy during the chlorination. After the chlorination was complete, the reaction mixture was cooled to about 25 C. by passing tap water through the jacket of the reaction flask. The bottom (product) phase was drained from the flask. | |
| With sodium 4-methylbenzenesulfinate; silver carbonate; In 1,4-dioxane; at 120℃; for 0.166667h;Microwave irradiation; | General procedure: Aryl sulfinate metal salt (0.36 mmol or 0.18 mmol), PdCl2 (0.06 mmol), AgNO3(0.6 mmol), DMF/DMSO (v/v = 19/1, 2 mL), and thiol (0.3 mmol) were added to the microwave tube. The tube was sealed and stirred for 5 min at ambient temperature. The tube was then heated at 40W for 10 min at 120 C. After cooling down, the resulting suspensions were filtered off and washed with CH2Cl2. A small amount of silica gel was added into the filtrate, and then evaporated. The residue was purified by flash chromatography on silica with hexane/EA to provide the desired product. | 
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 96% | With hydrogen sulfide; | EXAMPLE 8: METHYL 3,3'-DITHIODIPROPIONATE The same reactor as in example 1 is charged with 240 g of methyl 3-mercaptopropionate, 16 g of solid sulphur and 7 g of anhydrous Amberlyst A 21 resin. The mixture is stirred for one hour at ambient temperature. Then it is heated at 85° C. for one hour and a half. The disuphide (CH3 O--CO--CH2 CH2) 2 S2 is thus obtained with a yield of 96percent in relation to the sulphur added. | 
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 68.4% | With triethylamine; at -5 - 20℃; for 24.5 - 25.5h; | In a 500ml three neck flask equipped with a stirrer, a condenser and a thermometer, 26.7g(0.3mol) gamma-methoxypropylamine, 2.5ml triethylamine are added sequentially, the temperature of the reaction system was controlled to -5-5°C and maintained. Then 23.8g (0.1mol) beta-dimethyl dithiodipropionate prepared by the front step was dropped during 0.5-1.5 hours. After dropwise addition, the ice water bath was removed. The reaction was left standing for 24 hours under the room temperature, and then the reaction was over. A golden solid was obtained. And a light yellow solid product was yielded by vacuum filtration. After dried it was recrystallized with anhydrous alcohol. 24.1g white chip crystal was obtained, and the yield is 68.4percent, the boiling point is 103.3-105.1°C. | 
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 76% | In methanol; at 5℃; for 120h; | Example 1 Preparation of N,N'-di-n-octyl-3,3'-dithiodipropionamide The reaction scheme is as follows: (SCH2CH2CO2CH3)2+2C8H17NH2-->(SCH2CH2CONHC8H17)2+2CH3OH 238 g (1 mol) of dimethyl 3,3'-dithiodipropionamide and 280 g (2.17 mol) of n-octylamine were added into 300 ml of methanol in a 1,000 ml reaction flask, and the reactants stirred at 5° C. for 5 days (under nitrogen atmosphere, if desired). The reaction mixture was then cooled to -10° C., and separated by centrifuging to give 329 g of a solid of N,N'-di-n-octyl-3,3'-dithiodipropionamide (purity >95percent, yield 76percent). The mother liquor was recycled after methanol was recovered by evaporation. | 
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| With hydrogen sulfide; sodium sulfite; In water; at 50 - 55℃; under 760.051 Torr; for 10.25h; | To a 1000 mL flask were added 280.0 g (1.15 mol) of <strong>[15441-06-2]dimethyl 3,3'-dithiodipropionate</strong>, 106.5 g (0.845 mol) of anhydrous Na2SO3, and 296.0 g of water. The reaction mixture was warmed to a temperature of 50°C-55°C in water bath. H2S (about 0.025 L/min) was introduced into the above reaction mixture for a total of 10 h. After the reaction was carried out under atmospheric pressure for 1 h (began from the introduction of H2S), 80.0 g (0.635 mol) of Na2SO3 was added to the reaction mixture in 8 aliquots and each aliquot, i.e. 10.0 g of Na2SO3 was added every half hour. After the introduction of H2S was stopped, the reaction temperature was maintained for 15 min. The reaction liquid was filtered under suction, and the filtrate was layered. The oil layer was washed with water, and then layered again. The resulting oil layer was distilled under reduced pressure with a circulating water pump to give methyl 3-mercapto propionate. [0031] The contents of methyl 3-mercapto propionate, <strong>[15441-06-2]dimethyl 3,3'-dithiodipropionate</strong> and dimethyl 3,3'-trithiodipropionate were measured at different time points by gas chromatography and plotted. The results were shown in figure 1. [0032] It can be seen from figure 1 that the content of target product methyl 3-mercapto propionate was relatively high, and was about 66.5percent at 6.5 h. [0033] It can also be seen from figure 1 that the content of methyl 3-mercapto propionate increased rapidly from the beginning of the reaction to the 5.5th h, and it tended to increase slowly or even decrease after the reaction was carried out for 5.5 h. Therefore, in view of cost-benefit, the reaction time ranging from 5.5 h to 7.5 h is optimal | 
 [ 15441-06-2 ]
                                                    
                                                    [ 15441-06-2 ]

 [ 2935-90-2 ]
                                                    
                                                    [ 2935-90-2 ]
 [ 824-79-3 ]
                                                    
                                                    [ 824-79-3 ]
 [ 15441-06-2 ]
                                                    
                                                    [ 15441-06-2 ]
 [ 613-33-2 ]
                                                    
                                                    [ 613-33-2 ]
 [ 108-88-3 ]
                                                    
                                                    [ 108-88-3 ]
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 50%Chromat. | With silver(I) acetate; palladium dichloride; In dimethyl sulfoxide; N,N-dimethyl-formamide; at 120℃; for 0.166667h;Microwave irradiation; | General procedure: Aryl sulfinate metal salt (0.36 mmol or 0.18 mmol), PdCl2 (0.06 mmol), AgNO3(0.6 mmol), DMF/DMSO (v/v = 19/1, 2 mL), and thiol (0.3 mmol) were added to the microwave tube. The tube was sealed and stirred for 5 min at ambient temperature. The tube was then heated at 40W for 10 min at 120 °C. After cooling down, the resulting suspensions were filtered off and washed with CH2Cl2. A small amount of silica gel was added into the filtrate, and then evaporated. The residue was purified by flash chromatography on silica with hexane/EA to provide the desired product. | 
 [ 2935-90-2 ]
                                                    
                                                    [ 2935-90-2 ]
 [ 824-79-3 ]
                                                    
                                                    [ 824-79-3 ]
 [ 15441-06-2 ]
                                                    
                                                    [ 15441-06-2 ]
 [ 620-94-0 ]
                                                    
                                                    [ 620-94-0 ]
 [ 108-88-3 ]
                                                    
                                                    [ 108-88-3 ]
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 37%Chromat. | With silver nitrate; palladium dichloride; In dimethyl sulfoxide; N,N-dimethyl-formamide; at 120℃; for 0.166667h;Microwave irradiation; | General procedure: Aryl sulfinate metal salt (0.36 mmol or 0.18 mmol), PdCl2 (0.06 mmol), AgNO3(0.6 mmol), DMF/DMSO (v/v = 19/1, 2 mL), and thiol (0.3 mmol) were added to the microwave tube. The tube was sealed and stirred for 5 min at ambient temperature. The tube was then heated at 40W for 10 min at 120 °C. After cooling down, the resulting suspensions were filtered off and washed with CH2Cl2. A small amount of silica gel was added into the filtrate, and then evaporated. The residue was purified by flash chromatography on silica with hexane/EA to provide the desired product. | 
 [ 2935-90-2 ]
                                                    
                                                    [ 2935-90-2 ]
 [ 824-79-3 ]
                                                    
                                                    [ 824-79-3 ]
 [ 15441-06-2 ]
                                                    
                                                    [ 15441-06-2 ]
 [ 620-94-0 ]
                                                    
                                                    [ 620-94-0 ]
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 76%Chromat. | With silver carbonate; palladium dichloride; In tetrahydrofuran; at 120℃; for 0.166667h;Microwave irradiation; | General procedure: Aryl sulfinate metal salt (0.36 mmol or 0.18 mmol), PdCl2 (0.06 mmol), AgNO3(0.6 mmol), DMF/DMSO (v/v = 19/1, 2 mL), and thiol (0.3 mmol) were added to the microwave tube. The tube was sealed and stirred for 5 min at ambient temperature. The tube was then heated at 40W for 10 min at 120 °C. After cooling down, the resulting suspensions were filtered off and washed with CH2Cl2. A small amount of silica gel was added into the filtrate, and then evaporated. The residue was purified by flash chromatography on silica with hexane/EA to provide the desired product. | 
 [ 2935-90-2 ]
                                                    
                                                    [ 2935-90-2 ]
 [ 824-79-3 ]
                                                    
                                                    [ 824-79-3 ]
 [ 15441-06-2 ]
                                                    
                                                    [ 15441-06-2 ]
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 88%Chromat. | With silver nitrate; palladium dichloride; In dimethyl sulfoxide; N,N-dimethyl-formamide; at 120℃; for 0.166667h;Microwave irradiation; | General procedure: Aryl sulfinate metal salt (0.36 mmol or 0.18 mmol), PdCl2 (0.06 mmol), AgNO3(0.6 mmol), DMF/DMSO (v/v = 19/1, 2 mL), and thiol (0.3 mmol) were added to the microwave tube. The tube was sealed and stirred for 5 min at ambient temperature. The tube was then heated at 40W for 10 min at 120 °C. After cooling down, the resulting suspensions were filtered off and washed with CH2Cl2. A small amount of silica gel was added into the filtrate, and then evaporated. The residue was purified by flash chromatography on silica with hexane/EA to provide the desired product. | 
 [ 15441-06-2 ]
                                                    
                                                    [ 15441-06-2 ]

 [ 2935-90-2 ]
                                                    
                                                    [ 2935-90-2 ]
 [ 1394285-00-7 ]
                                                    
                                                    [ 1394285-00-7 ]
 [ 15441-06-2 ]
                                                    
                                                    [ 15441-06-2 ]
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 83% | With triethylamine; In acetonitrile; at 65℃; for 120h;Inert atmosphere; | General procedure: Dichlorodipyrrin (1 eq.) and dry acetonitrile were placed to three necked round bottom flask equipped with magnetic stirring bar, stoppered by rubber septa and flushed with argon via needles. Then a solution of the nucleophile (ca. 4 eq.) in CH3CN and triethylamine (ca. 6 eq.) have been added by the syringe, reaction flask was immersed into an oil bath heated to 65°C (unless otherwise specified). After a specified time period, the solvent was removed on rotary evaporator, the residue was dried on the vacuum line at 5*10?2Torr at 80?90°C to remove the base and one of the substrates and processed as cited below. | 
 [ 2935-90-2 ]
                                                    
                                                    [ 2935-90-2 ]
 [ 1013388-00-5 ]
                                                    
                                                    [ 1013388-00-5 ]
 [ 15441-06-2 ]
                                                    
                                                    [ 15441-06-2 ]
| Yield | Reaction Conditions | Operation in experiment | 
|---|---|---|
| 84% | With triethylamine; In acetonitrile; at 70℃; for 21h;Inert atmosphere; | General procedure: Dichlorodipyrrin (1 eq.) and dry acetonitrile were placed to three necked round bottom flask equipped with magnetic stirring bar, stoppered by rubber septa and flushed with argon via needles. Then a solution of the nucleophile (ca. 4 eq.) in CH3CN and triethylamine (ca. 6 eq.) have been added by the syringe, reaction flask was immersed into an oil bath heated to 65°C (unless otherwise specified). After a specified time period, the solvent was removed on rotary evaporator, the residue was dried on the vacuum line at 5*10?2Torr at 80?90°C to remove the base and one of the substrates and processed as cited below. | 

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