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0 °C

To a suspension of 13-allyl-9,10-dimethoxy-5,6-dihydro-[1,3]dioxolo[4,5-g]isoquino[3,2-a]isoquinolin-7-ylium; bromide (300 mg, 0.66 mmol) in anhydrous diethyl ether (20 mL) at 0° C. was added a solution of isopropenylmagnesium bromide in tetrahydrofuran (0.5 M, 20 mL, 10 mmol) dropwise. After stirring at 0° C. for 30 min, the reaction was quenched by adding saturated aqueous ammonium chloride solution (50 mL). The mixture was extracted with diethyl ether (2×100 mL), washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was re-crystallized from diethyl ether to afford 13-allyl-8-isopropenyl-9,10-dimethoxy-5,8-dihydro-6H-[1,3]dioxolo[4,5-g]isoquino[3,2-a]isoquinoline (75 mg, 27%). LC/MS m/e calcd for C26H27NO4 (M+H)+: 418.51, observed: 418.2; 1H NMR (400 MHz, DMSO-d6) δ ppm 1.57 (s, 3 H) 2.64-2.80 (m, 2 H) 2.97-3.06 (m, 1 H) 3.18-3.25 (m, 1 H) 3.72 (s, 3 H) 3.79 (s, 3 H) 4.63 (s, 1 H) 4.73 (s, 1 H) 5.06-5.18 (m, 3 H) 6.02 (s, 2 H) 6.05-6.15 (m, 1 H) 6.81 (m, 1 H) 6.86 (s, 1 H) 6.91 (m, 1 H) 6.98 (s, 1 H).

1. customthe reaction was quenched
2. additionby adding saturated aqueous ammonium chloride solution (50 mL)
3. extractionThe mixture was extracted with diethyl ether (2×100 mL)
4. washwashed with brine
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated in vacuo
7. customThe residue was re-crystallized from diethyl ether