反应详情

Methyl pyropheophorbide-a (2, 250 mg) was dissolved in distilled tetrahydrofuran (50 ml) and 4N HCl (125 ml) was added in one lot. The reaction mixture was stirred under nitrogen atmosphere at room temperature for 4 hours. The reaction was monitored by analytical tlc (silica plates), using 10% methanol/dichloromethane as a mobile phase. The reaction mixture was then poured in ice water, extracted with dichloromethane. The dichloromethane layer was washed several times with water (3×200 ml). The organic layer was separated and dried over anhydrous sodium sulfate. Evaporation of the solvent gave a residue, which was crystallized from dichloromethane/hexane. Yield, 225 mg. The purity of the compound was ascertained by tlc and the structure was confirmed by NMR spectroscopy. The NMR data were similar as described for 2 except the resonances for the —OCH3 protons of the propionic ester (—CH2CH2CO2CH3) were missing.

1. extractionextracted with dichloromethane
2. washThe dichloromethane layer was washed several times with water (3×200 ml)
3. customThe organic layer was separated
4. dry with materialdried over anhydrous sodium sulfate
5. customEvaporation of the solvent
6. customgave a residue, which
7. customwas crystallized from dichloromethane/hexane
8. customYield