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CAS No. : | 930-88-1 | MDL No. : | MFCD00005508 |
Formula : | C5H5NO2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | SEEYREPSKCQBBF-UHFFFAOYSA-N |
M.W : | 111.10 | Pubchem ID : | 70261 |
Synonyms : |
|
Signal Word: | Danger | Class: | 8 |
Precautionary Statements: | P260-P264-P270-P272-P280-P301+P312+P330-P301+P330+P331-P303+P361+P353-P304+P340+P310-P305+P351+P338+P310-P333+P313-P362+P364-P405-P501 | UN#: | 1759 |
Hazard Statements: | H302-H314-H317 | Packing Group: | Ⅱ |
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 hydrogenchloride; sodium hydrogencarbonate; sodium nitrite; In water; isopropyl alcohol; acetone; | EXAMPLE 19 3a-(1,3-Benzodioxol-5-yl)-2,3,3a,4,7,7a-hexahydro-2-methyl-4,7-methano-1H-isoindole fumarate (1:1) A 30.9 g amount of <strong>[2620-45-3]3,4-methylenedioxyaniline hydrochloride</strong> was dissolved in 90 ml of water and 40 ml of concentrated hydrochloric acid. The solution was cooled to 5 C. in an ice-salt bath and a solution of 12.3 g of sodium nitrite in 35 ml of water was added dropwise to the reaction mixture over a 25 minute period. A solution of 20.0 g of N-methylmaleimide and 2.4 g of cupric chloride in 150 ml of acetone was added to the reaction mixture portionwise with stirring. The reaction mixture temperature was maintained at 3 C. and the pH was adjusted to 3.2 by the addition of about 30 g of sodium bicarbonate. After standing at room temperature for 16 hours the mixture was filtered to collect a black solid. The solid was dried. Then the solid was dissolved in 500 ml of isopropanol containing 19.5 g of 2,6-lutidine. The mixture was heated to boiling and filtered hot to collect 4.8 g of isoluble material. The filtrate was cooled and an additional 2.6 g of precipitate was collected. This filtrate was reduced in volume to 200 ml and cooled and filtered to collect 2.7 g more of precipitate. The final filtrate was diluted with water and filtered to collect 0.9 g of additional material. The precipitates were combined and subjected to preparative liquid chromatography using a silica gel column and ethyl acetate:hexane (1:1) as eluent. The second cut, 0.6 g was recrystallized from ethyl acetate to give 0.1 g of 3-(1,3-benzodioxol-5-yl)-1-methyl-1H-pyrrole-2,5-dione as a brown solid, mp 210-215 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
at 20℃; for 0.5h;Inert atmosphere; | To 50.0 mg (0.0483 mmol, 1 equiv.) of Pd2dba3?CHCl3 in 1.5mL of anhydrous acetone was added 134.0 mg (1.449 mmol, 30 equiv.) of norbornadiene and 27.0 mg(0.242 mmol, 5 equiv.) of N-methylmaleimide under an atmosphere of argon. The reaction mixture wasstirred for 30 min at room temperature, upon which noticeable palladium black had accumulated in thereaction vessel. The reaction mixture was transferred via cannula and filtered under argon to provide atranslucent yellow-green solution. The solution was briefly concentrated in vacuo to provide a moreviscous, yellow-green oil, to which 5.0 mL of anhydrous Et2O was added. This provided an opaque,yellow-green suspension of Pd(NBD)(NMM) catalyst as a fine yellow powder, which was usedimmediately in the coupling reaction, to avoid degradation. |
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