反应详情

A stirred solution of 0.40 gram (0.0018 mole) of ethyl 5-chloro-4-nitropyrrole-2-carboxylate and 10 mL (excess) of an aqueous solution of 10% sodium hydroxide in 25 mL of methanol was warmed to 80° C. where it was maintained during a 1.5-hour period. After this time the reaction mixture was cooled and the methanol was removed under reduced pressure. The concentrate was diluted with 50 mL of water and 50 mL of ethyl acetate, and acidified to a pH of about 2.0. The organic layer was separated, dried with sodium sulfate, filtered, and the filtrate was concentrated under reduced pressure to a residue. The yield of the subject compound was 0.34 gram. The NMR spectrum was consistent with the proposed structure.

1. temperaturewas maintained during a 1.5-hour period
2. temperatureAfter this time the reaction mixture was cooled
3. customthe methanol was removed under reduced pressure
4. additionThe concentrate was diluted with 50 mL of water and 50 mL of ethyl acetate
5. customThe organic layer was separated
6. dry with materialdried with sodium sulfate
7. filtrationfiltered
8. concentrationthe filtrate was concentrated under reduced pressure to a residue