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To anhydrous N,N-dimethylformamide (0.129 mL, 1.51 mmol) at 0° C. was added phosphorus oxychloride (0.068 mL, 0.67 mmol) dropwise. The mixture was warmed to room temperature and stirred for 30 minutes. The mixture was cooled in an ice-bath, 6-(3-acetoxy-propoxy)-7-methoxy-1-(3-methoxy-benzyl)-1H-isoquinoline-2-carboxylic acid ethyl ester (142 mg, 0.30 mmol) in dichloromethane (2 mL) was added dropwise. After addition was complete, the mixture was heated on an oil bath for 4 hrs at 80° C. The mixture was cooled to 0° C. and a solution of potassium acetate (196 mg, 1.82 mmol) in water (2 mL) was added slowly. The mixture was then heated at 80° C. for 20 minutes. The mixture was cooled, poured into water and diluted with dichloromethane (60 m]L). The organic layer was washed water (2×20 mL), saturated aqueous sodium bicarbonate solution (20 mL), saturated aqueous sodium chloride solution (20 mL), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo to afford 6-(3-acetoxy-propoxy)-4-formyl-7-methoxy-1-(3-methoxy-benzyl)-1H-isoquinoline-2-carboxylic acid ethyl ester (150 mg, 99% yield) as a yellow oil. The crude product was without further purification.

1. temperatureThe mixture was cooled in an ice-bath
2. additionAfter addition
3. temperaturethe mixture was heated on an oil bath for 4 hrs at 80° C
4. temperatureThe mixture was cooled to 0° C.
5. temperatureThe mixture was then heated at 80° C. for 20 minutes
6. temperatureThe mixture was cooled
7. washThe organic layer was washed water (2×20 mL), saturated aqueous sodium bicarbonate solution (20 mL), saturated aqueous sodium chloride solution (20 mL)
8. dry with materialdried over anhydrous magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo