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CAS No. : | 7312-11-0 | MDL No. : | MFCD05662034 |
Formula : | C10H7BrO2S | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | XDYVZHUZZZKQOS-UHFFFAOYSA-N |
M.W : | 271.13 | Pubchem ID : | 2824065 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302+H312+H332-H315-H319-H335 | 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 |
---|---|---|
26% | Intermediate 14) Synthesis of 5-(l,l-dioxidotetrahydrothiophen-2- yl)benzo[6]thiophene-2-carboxylic acid (a) Synthesis of methyl 5-(l,l-dioxidotetrahydrothiophen-2-yl)benzo[b]thiophene- 2-carboxylate Tetrahydrothiophene 1,1 -dioxide (124.0 mg, 1.03 mmol) was dissolved in anhydrous THF (7.3 mL), and 1M solution of lithium bis(trimethylsilyl)amide in THF (1.5 mL, 1.55 mmol) was added dropwise at -20C. The reaction mixture was stirred at room temperature for 30 minutes, and ZnCl2 (211.0 mg, 1.55 mmol) was added -20C. The reaction mixture was slowly warmed to room temperature, methyl 5- bromobenzo[b]thiophene-2-carboxylate (200.0 mg, 0.74 mmol), Pd(OAc)2 (8.3 mg, 0.04 mmol) and XPhos (35.2 mg, 0.07 mmol) were added, and stirred at 65C for 5 hours. The reaction mixture was cooled to room temperature, H20 was added, and extracted with EtOAc. The organic extract was washed with brine, dried over anhydrous Na2S04 and concentrated under reduced pressure. The residue was purified by flash column chromatography (silica gel, n-Hex : EtOAc = 9 : 1) to obtain methyl 5-(l,l- dioxidotetrahydrothiophen-2-yl)benzo[b]thiophene-2-carboxylate (60.0 mg, 26%) as an off-white solid. 1H-NMR (400MHz, CDC13): delta 8.06 (s, 1H), 7.89-7.91 (m, 2H), 7.49 (dd, 1H, J=8.4, 2.0Hz), 4.30 (m, 1H), 3.95 (s, 3H), 2.95-3.35 (m, 3H), 2.22-2.58 (m, 3H) |
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