反应详情

0.2 g of platinum oxide catalyst was added to 20 ml of methanol, through which hydrogen was passed to activate the catalyst. 10.81 g (60 mmol) of 2-methoxy-3,4-methylenedioxybenzaldehyde (1) and 6.37 g (60 mmol) of aminoacetaldehyde dimethylacetal (99% purity) in 20 ml of methanol were added to carry out hydrogenation for 3.5 hours. Then, 5.24 ml (66 mmol) of 35% formalin was added to carry out hydrogenation for 9 hours. The catalyst was filtered out and the filtrate was concentrated under vacuum to obtain 16.85 g of N-(2-methoxy-3,4-methylenedioxybenzyl)-N-methylaminoacetaldehyde dimethylacetal (3) as an oil (yield 99%). IR and NMR spectra of the resultant product are listed below. ##STR24##

1. customfor 3.5 hours
2. customfor 9 hours
3. filtrationThe catalyst was filtered out
4. concentrationthe filtrate was concentrated under vacuum