General procedure for the synthesis of 7-amino-3,4-dihydroisoquinolin-1(2H)-one from 7-nitro-3,4-dihydroisoquinolin-1(2H)-one: 7-nitro-3,4-dihydroisoquinolin-1(2H)-one (700 mg, 3.6 mmol) was dissolved in methanol (25 mL), and 10% palladium/carbon catalyst (catalytic amount) was added. The reaction was stirred under hydrogen (60 psi) atmosphere for 1 hour. Upon completion of the reaction, the mixture was filtered through diatomaceous earth to remove the catalyst and the filtrate was concentrated under vacuum to afford 7-amino-3,4-dihydroisoquinolin-1(2H)-one (500 mg, 86% yield). The product was characterized by 1H NMR (400 MHz, CD3OD): δ 2.81 (t, J = 6.59 Hz, 2H), 3.42 (t, J = 6.55 Hz, 2H), 6.84 (dd, J = 8.13,2.42 Hz, 1H), 7.02 (d, J = 7.91 Hz, 1H), 7.26 (d, J = 2.64 Hz, 1H ).
