Reaction Steps
1.56 g (11.69 mmol) of AlCl3 were suspended in 60 ml of MTBE at room temperature. After stirring for 45 minutes, the reaction mixture was cooled to 0° C. and LiAlH4 (1.32 g, 34.65 mmol) was added a little at a time. After the addition was complete and the mixture had been stirred for another 15 minutes, compound 8 (1.00 g, 4.56 mmol) was added and the mixture was stirred at 0° C. for another hour. The reaction mixture was subsequently refluxed for 8 hours and after cooling to room temperature was poured into ice water. The precipitated inorganic solid was filtered off with suction and washed twice with 30 ml of DCM. The aqueous phase was brought to a pH of 12 and extracted three times with 40 ml of DCM. The combined extracts were dried over Na2SO4 and the solvent was distilled off on a rotary evaporator. The crude product was purified by flash chromatography on silica gel (EtOAc/MeOH/NEt3, 10:0.5:1). This gave 0.52 g (60%) of a colorless oil which solidified in the freezer. Rf=0.47 (EtOAc/MeOH/NEt3, 10:0.5:1). 1H NMR: (400 MHz, CDCl3): δ=1.15 (q, 3J=14 Hz, 6H, CH3), 3.22 (m, 3J=6 Hz, 2H, H-3), 3.23 (m, 2J=14 Hz, 4H, CH2), 3.42 (m, 3J=6 Hz, 2H, H-2), 6.34 (d, 3J=5.2 Hz, 1H, H-8), 7.69 (s, 1H, H-5), 7.75 (d, 3J=5.2 Hz, 1H, H-7). 13C NMR: (100 MHz, CDCl3): δ=10.1, 10.4 (CH3), 44.6, 46.5 (CH2, C-2, C-3), 44.9, 45.0 (CH2), 104.0 (C-8), 130.5, 130.1 (Cq), 131.8 (C-5), 140.7 (C-7). GC-MS (EI): RT 8.63 min, m/e (%): 192 (10), 191 (M+, 100), 190 (4), 177 (8), 176 (95), 175 (5), 162 (11), 161 (8), 160 (5), 148 (13), 147 (10), 146 (8), 135 (2), 134 (9), 133 (6), 131 (8), 121 (2), 119 (4), 118 (3), 107 (3), 104 (2), 92 (2), 91 (2), 80 (8), 77 (4) IR (KBr): ν=3436 (s), 3112 (w), 3019 (w), 2964 (w), 1661 (s), 1686 (vs), 1583 (m), 1497 (m), 1409 (s), 1363 (w), 1332 (m), 1311 (s), 1260 (m), 1249 (w), 1232 (m), 1220 (m), 1180 (m), 1150 (w), 1119 (m), 1064 (w), 1035 (m), 985 (m), 970 (m), 886 (s), 858 (m), 847 (m), 802 (m), 765 (w), 740 (w), 704 (w), 647 (w), 614 (w), 592 (w), 577 (m), 570 (m), 507 (w) cm−1. HRMS (EI) calculated for C11H17N3 [M+]: 191.1422; found: 191.1430.
