6,7-Dimethoxy-1,2,3,4-Tetrahydroisoquinoline → HCID 178418719, compound

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Reaction Steps

3-Chloro-6,7-dimethoxy-2H-benzo[1,2,4]thiadiazine-1,1-dioxide 1a (154 mg, 0.55 mmol) and 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline 2a (wherein R1 and R4 are hydrogen, and R2 and R3 are methoxy) (138 mg, 0.6 mmol) were dissolved in 20 ml of methoxyethanol and heated at reflux for 72 h. The solvent was removed under reduced pressure. The gummy residue was triturated with isopropanol and the resulting crystals filtered. Recrystallization from dichloromethane afforded 120 mg of 3-(6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl)-6,7-dimethoxy-2H-benzo[1,2,4]thiadiazine-1,1-dioxide 101, [M+H]+=434.

Provenance & Evidence