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CAS No. : | 2380-94-1 | MDL No. : | MFCD00005667 |
Formula : | C8H7NO | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | NLMQHXUGJIAKTH-UHFFFAOYSA-N |
M.W : | 133.15 | Pubchem ID : | 75421 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | 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 |
---|---|---|
99.2% | With pyridine; In dichloromethane; at 0 - 25℃;Inert atmosphere; Large scale; | 4-hydroxyindole (1eq. limiting reagent) was charged to a vessel under N2 followed by DCM (dichloromethane; 6 vol based on 4-hydroxyindole charge). The reaction was cooled to 0-5C and pyridine added (1.2 eq) dropwise at 0-5C. Acetic anhydride (1.1 eq) was added dropwise at 0-5C and the reaction warmed to 20-25C for 1 - 1.5 hrs and stirred at 20-25C for a further 3 hours. The reaction was sampled and analysed for completion. The reaction was then washed three times with 20% aqueous citric acid solution (3 x 3 vol based on 4-hydroxyindole charge) and once with sat. NaHCC-3 (3 vol based on 4-hydroxyindole charge). The DCM solution was dried over MgSC and filtered and the DCM layer concentrated to half volume by distillation. Heptane (6 vol based on 4-hydroxyindole charge) was added and further DC was removed by distillation until full precipitation of the Stage 1 had occurred. The reaction was cooled to 15-25C and the solids collected by filtration, washing with heptane (1 vol based on 4-hydroxyindole charge) dried under vacuum overnight at 60C. |