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CAS No. : | 123654-26-2 | MDL No. : | MFCD12923204 |
Formula : | C9H8ClNO3 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | KRMUVKSAOVLXLF-UHFFFAOYSA-N |
M.W : | 213.62 | Pubchem ID : | 10632401 |
Synonyms : |
|
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
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* 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 |
---|---|---|
89.8% | at 90℃; for 8 h; | The resulting intermediate 7 (30 g, 0.11 mol), water (150 mL),Propylene glycol monomethyl ether (36mL) and 50percent sodium hydroxide solution (90mL), slowly heated to 90 ° C with stirring, the same temperature for 8h, the reaction was monitored by TLC. After the reaction is completed,Cooled to 5 ° C with ice bath and stirred for 2h, filtered with suction,The filter cake was washed with an appropriate amount of water added to 500mL single-necked flask,Water (210 mL) and propylene glycol monomethyl ether (35 mL) were added,The temperature of the reaction solution was raised to 80 ° C and the reaction solution became homogeneous.Dilute dilute hydrochloric acid, adjust pH to about 3, precipitated solid.After cooling to 10 ° C, stirring was continued for 2h. Suction filtration,The filter cake was washed with an appropriate amount of water and dried to give an off-white solid,Yield 20.8g, yield 89.8percent, purity 99percent |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
32.2% | With n-butyllithium In tetrahydrofuran; hexane; water | b) To a cooled (-70° C.) and stirred mixture of 15.6 parts of a solution of n.butyllithium in hexane 2.5M and 44.5 parts of tetrahydrofuran was added dropwise a solution of 4 parts of intermediate 8 in 26.7 parts of tetrahydrofuran under a nitrogen flow. The reaction mixture was stirred for 1 hour at about -60° C. and was poured into a saturated suspension of carbondioxide (ice) in 44.5 parts of tetrahydrofuran. The whole was allowed to warm up to room temperature while being stirred and 80 parts of water were added. The aqueous layer was neutralized with hydrochloric acid and the formed precipitate was filtered off and dried in vacuo at 60° C., yielding 1.1 parts (32.2percent) of 4-amino-5-chloro-2,3-dihydro-7-benzofurancarboxylic acid; mp. 258.4° C. (interm. 9). In a similar manner there was also prepared: |
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