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CAS No. : | 59937-01-8 | MDL No. : | MFCD06205115 |
Formula : | C12H11NO2S | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | UKKGDCGESAFSJY-UHFFFAOYSA-N |
M.W : | 233.29 | Pubchem ID : | 10036966 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302 | Packing Group: | N/A |
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 |
---|---|---|
98% | With water; sodium hydroxide; In methanol; at 20℃; for 1.03h; | A solution of ethyl 2-phenylthiazole-4-carboxylate (Example 4B, 3.046 g, 13.06 mmol) in methanol (20 mL) was treated with a solution of NaOH (1.044 g, 26.1 mmol) in water (10 mL) added dropwise over 2 min and the resulting solution was stirred at room temperature for 1 h. The methanol was then evaporated under reduced pressure and the residual paste was diluted with a mixture of water (30 mL) and ethyl acetate (200 mL). The pH was adjusted to ~3 with concentrated hydrochloric acid, the organic phase was separated and the aqueous phase was re-extracted with ethyl acetate (2 x 150 mL). The combined organic extract was washed with brine (3 x 35 mL) and dried over anhydrous magnesium sulfate. After concentration of the solvent under reduced pressure, the solid residue obtained was dried in vacuo for 18 h to yield 2.629 g (98%) of the title compound as a white crystalline solid. LC (Method A): 1.842 min. HRMS(ESI) Anal.Calcd for C10H8NO2S [M+H]+ m/z 206.027; found 206.0266. 1H NMR (CDCL3, 400 MHz) delta ppm: 8.30 (s, 1H), 7.94 - 8.05 (m, 2H), 7.4 - 7.55 (m, 3H). |
94.9% | With sodium hydroxide; In methanol; at 20℃; for 4h; | General procedure: Sodium hydroxide (2N) was added to a solution of intermediate 2a-i (1 equiv.) in methanol at ambient temperature. The reaction mixture was stirred for 4h and the methanol was removed by rotary evaporation. The resultant mixture was adjusted to pH=5-6 with 1N HCl solution. The precipitated white solid was collected by filtration and dried to give the carboxylic acid intermediate (1a-i). |
80% | With lithium hydroxide monohydrate; In tetrahydrofuran; methanol; water; at 20℃; for 4h; | General procedure: To a solution of the obtained ethyl ester intermediate (1 equiv) in 2:3:1 THF/MeOH/H2O (18 ml) was added LiOH·H2O (1.5 equiv). After stirring at room temperature for 4 h, the volatiles were removed under reduced pressure. The residue was acidified with 1N hydrochloric acid solution, and then filtered and the filter cake was washed with 5 mL of water, dried in vacuum to afford a white powder. Recrystallization from 75% EtOH gave the desired compounds 1-8. |
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