“…8,9-Dimethoxy-10b-methyl-1,5,6,10b-tetrahydropyrrolo-[2,1-a]isoquinolin-3(2H)-one (3b). According to General Procedure, hydroxy lactam 5b (280 mg, 1 mmol) was treated with TFA in CH2Cl2 at 20 °C for 4 h. After workup, pure pyrroloisoquinolone 3b was obtained (255 mg, 98%) as a reddish oil: IR (CHCl3) 1685, 1520 cm (9), 185 (4), 172 (4), 123 (6), 117 (4), 91 (5), 77 (8).…”