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CAS No. : | 108-33-8 | MDL No. : | MFCD00003110 |
Formula : | C3H5N3S | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | HMPUHXCGUHDVBI-UHFFFAOYSA-N |
M.W : | 115.16 | Pubchem ID : | 66949 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* 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 |
---|---|---|
With hydrogen bromide; bromine; sodium nitrite; In water; at 0 - 10℃; for 1h; | Into a 250-mL 3-necked round-bottom flask wereplaced 5-methyl-1,3,4-thiadiazol-2-amine (20.0 g, 173.68 mmol, 1.0 equiv) and HBr/H20 (50mL). This was followed by the addition of Br2 (50 mL) dropwise with stirring at 0C. To this was added a solution of NaNO2 (30.4 g, 440.58 mmol, 2.5 equiv) in water (50 mL) dropwise with stirring at 0-10C. The resulting solution was stirred for 1 h at 0C in a water/ice bath. The reaction was then quenched by the addition of Na25203 (sat., 100 mL). The pH value of thesolution was adjusted to 8-9 with sodium hydroxide (4 N). The resulting solution was extracted with DCM (3 x 500 mL) and the organic layers were combined, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo to dryness to afford the title product. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogen bromide; sodium nitrite; | Step 1 2-Bromo-5-methyl-1,3,4-thiadiazole To a solution of aqueous hydrobromic acid (48%, 40 mL) containing a trace amount of copper powder at -10 C. is added a mixture of 2-amino-5-methyl-1,3,4-thiadiazole (2.88 g) and sodium nitrite (7.76 g) portionwise over 45 mins with vigorous stirring. The resulting mixture is stirred at -10 C. for 1.5 hrs and at ambient temperature for an additional 1.5 hrs and is then cooled in an ice bath, neutralized with aqueous sodium hydroxide (50%), diluted with saturated aqueous sodium hydrogensulfite till the mixture no longer turns potassium iodide-starch test paper blue and filtered to remove insoluble material (rinsing with hot water). The filtrate is extracted with methylene chloride (4*100 mL), and the combined organic phase is dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the crude produce which is then chromatographed on silica gel (70-230 mesh, 75 g), eluding with ethyl acetate/hexane (50/50). Pooling and concentration of those fractions with an Rf =0.78 by TLC (methanol/chloroform, 10/90) gives the title compound, mp 107-108 C. |
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