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CAS No. : | 694514-19-7 | MDL No. : | MFCD20484368 |
Formula : | C8H7BrF3NO | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | NUFDHHXRRSOFSF-UHFFFAOYSA-N |
M.W : | 270.05 | Pubchem ID : | 68604174 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-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 |
---|---|---|
step 4-; A 100 mL round bottom flask fitted with a stir bar and septum was charged with HOAc (50 mL) then 2-bromoacrolein (1.91 g) was added. To the stirred mixture was added dropwise Br2 dropwise until the red color persisted (ca. 720 muL). To this solution was added a solution of 84b (3.48 g) HOAc (15 mL). A thick precipitate formed and stirring was continued at 100 C. for 1 h. The precipitate dissolved to give a clear dark amber solution after 10 min. A second precipitate formed after 30 min. The reaction was cooled to RT and poured into a stirred ice cold solution of 2.0 M aq. NaOH (550 mL). To the mixture was slowly added 2.0 M aq. Na2CO3 [vigorous foaming] until the solution was pH ca. 8 and the resulting solution extracted with DCM (3×250 mL). The combined extracts were washed brine (500 mL), dried (Na2SO4), filtered and concentrated in vacuo to afford a dark resin that was purified by flash chromatography (385 g Supelco VersaPak SiO2 column) and eluted with a DCM/hexane gradient (0 to 100% DCM) over 10 column volumes. LC-MS and TLC analysis indicated the compound was not pure. The product was re-chromatographed (100 g Supelco VersaPak SiO2 column) and eluted with an EtOAc/hexane gradient (0 to 100% EtOAc) over 30 column volumes to afford 938 mg of 86 as an off-white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
step 3-; A 100 mL round bottom flask fitted with a stir bar and septum was charged with 84a (3.01) g and maintained nitrogen atmosphere. To the flask was added anhydrous dioxane (25 mL) and HOAc (7.5 mL). The solution was stirred rapidly in an ice bath and a solution of bromine and dioxane (20 mL, 0.135 g Br2/mL) was added dropwise over 30 min using a syringe pump. A beige precipitate formed and the mixture thickened. The ice bath was removed and the reaction mixture stirred at RT for 1 h. The reaction mixture was poured into a mixture of 1.0 M NaOH (150 mL) and 2.0 M Na2CO3 (150 mL) and extracted with DCM (3×100 mL). The combined extracts were washed sequentially with 0.5 M Na2CO3 (150 mL) and brine (150 mL), dried (Na2SO4), filtered and concentrated in vacuo. The resulting pale yellow liquid slowly solidified and darkened to afford 84b (4.10 g) black crystalline solid. |
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