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ChemicalBook CAS DataBase List 6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride
2328-12-3

6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride synthesis

3synthesis methods
Formaldehyde

50-00-0

3,4-Dimethoxyphenethylamine

120-20-7

6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride

2328-12-3

In a 250 mL single neck flask, 3,4-dimethoxyphenethylamine (18.1 g, 100 mmol), paraformaldehyde (3.6 g, 120 mmol) and anhydrous ethanol (30 mL) were added sequentially. Upon completion of the reaction, the mixture was cooled to room temperature and white crystals were collected by filtration to yield 14.2 g of 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride in 61.8% yield.

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Yield:2328-12-3 61.8%

Reaction Conditions:

Stage #1:formaldehyd;2-(3,4-dimethoxyphenyl)-ethylamine in ethanol at 20; for 3 h;
Stage #2: with hydrogenchloride in ethanol;water; pH=2 for 4 h;Reflux;

Steps:

1 Example 1Preparation of 6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride (ii)
In a 250 ml single-necked flask, 3,4-dimethoxyphenylethylamine (18.1 g, 100 mmol) and paraformaldehyde (3.6 g,120mmol), absolute ethanol (30ml). After stirring for 3 h at room temperature, the pH was adjusted to 2 with concentrated hydrochloric acid, and the mixture was heated to reflux for 4 h. The mixture was cooled and filtered.White crystalline hydrochloride salt 14.2 g, yield 61.8%

References:

China Pharmaceutical University;Huang Wenlong;Qian Hai;Liao Chen;He Siman;Li Huilan CN107573325, 2018, A Location in patent:Paragraph 0109; 0110; 0111

FullText

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