Hydrogen Bromide → 2-(5-bromomethyl-3,4-dihydro-1H-isoquinolin-2-yl)-6,7-dimethoxy-3H-quinazolin-4-one

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Reaction Steps

2-(5-Hydroxymethyl-3,4-dihydro-1H-isoquinolin-2-yl)-6,7-dimethoxy-1H-quinazolin-4-one 22a (0.2 g, 0.54 mmol) was dissolved to room temperature in 5 mL of 48% hydrobromic acid and stirred to room temperature for 24 h. The precipitated product was separated by filtration, rinsed with water, dried to yield 0.21 g (91%) 2-(5-bromomethyl-3,4-dihydro-1H-isoquinolin-2-yl)-6,7-dimethoxy-3H-quinazolin-4-one 23a.

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