反应详情

To a solution of thiophene-3-carboxylic acid (26.65 g) in THF (300 ml) was added 2M lithium diisopropylamide (229 ml) dropwise at 0–5° C. with stirring under nitrogen, and the resulting mixture stirred for 15 min. A solution of N-methoxy-N,2-dimethylpropanamide (30 g) in THF (150 ml) was added dropwise over a period of 1 hr. When the addition was complete, the reaction mixture was allowed to warm to room temperature and stirred for 2 hr. It was poured onto water, the layers separated and the aqueous washed with ether. The aqueous was acidified with conc. hydrochloric acid and extracted with ethyl acetate, the organic extracts were dried over anhydrous magnesium sulfate, filtered and evaporated under reduced pressure to give the sub-title compound as a solid (38.91 g).

1. stirringthe resulting mixture stirred for 15 min
2. additionWhen the addition
3. stirringstirred for 2 hr
4. additionIt was poured onto water
5. customthe layers separated
6. washthe aqueous washed with ether
7. extractionextracted with ethyl acetate
8. dry with materialthe organic extracts were dried over anhydrous magnesium sulfate
9. filtrationfiltered
10. customevaporated under reduced pressure