反应详情

3-(1-hydroxyethyl)-4-(5-(4,4,5,5-tetramethyl-1,3-dioxolan-2-yl)thiophen-2-yl)-1H-isochromen-1-one (Intermediate B29, 940 mg, 2.347 mmol) was dissolved in 20 ml of MeCN and 20 ml of HCl 1M were added. The clear yellow solution was stirred overnight at rt. The mixture was diluted with 50 ml of water and 200 ml of EtOAc were added. then stirred for 20 min. Phases were separated and the organic one was washed again with 100 ml of NaHCO3 sat. sol. Phases were separated again and the organic one was dried over sodium sulfate, filtered and concentrated to dryness to leave 5-(3-(1-hydroxyethyl)-1-oxo-1H-isochromen-4-yl)thiophene-2-carbaldehyde (700 mg, 2.331 mmol, 99% yield) as a yellow fluffy solid

1. additionwere added
2. stirringthen stirred for 20 min
3. customPhases were separated
4. washthe organic one was washed again with 100 ml of NaHCO3 sat. sol. Phases
5. customwere separated again
6. dry with materialthe organic one was dried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated to dryness