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Experimental procedure:
A mixture of epoxide (5 mmol), indole (5 mmol) and InCl3 (10
mol%) in dichloromethane (15 mL) was stirred at ambient
temperature for an appropriate time (Table). After completion of
the reaction, as indicated by TLC, the reaction mixture was diluted
with water (2 × 10 mL) and extracted with dichloromethane
(2 × 15 mL). The aqueous layer was concentrated in vacuo
to recover the catalyst. The combined organic layers were dried over
anhydrous Na2SO4, concentrated in vacuo and
purified by column chromatography on silica gel (Merck, 100-200 mesh,
ethyl acetate-hexane 2:8) to afford pure product. Spectral
data for selected compounds 3a : Solid,
mp 121-122 °C; IR (KBr): 3520, 3050, 1640, 1500,
1240, 700 cm-1; 1H
NMR (200 MHz, CDCl3): δ 2.13 (br s, 1 H, OH),
4.10 (dd, J = 10.5, 6.7 Hz,
1 H), 4.20 (dd, J = 10.5, 6.7
Hz, 1 H), 4.45 (t, 1 H, J = 6.7
Hz), 7.03 (dd, J = 8.0, 1.8
Hz, 1 H), 7.07 (d, J = 1.8 Hz,
1 H), 7.16 (dd, J = 8.0, 1.8
Hz, 1 H), 7.21 (m, 1 H), 7.26-7.36 (m, 5 H), 7.44 (d, J = 8.0 Hz, 1 H), 8.05 (brs, NH,
1 H); EIMS m/z: 237 (M+);
Anal. Calcd for C16H15NO (237.30): C, 80.98;
H, 6.37; N, 5.90. Found: C, 80.95; H, 6.44; N, 5.95.
4f : Solid, mp 83-84 °C;
IR (KBr): 3420, 2980, 1597, 1481,1240, 770 cm-1; 1H
NMR (200 MHz, CDCl3): δ 2.35 (br s, 1 H, OH),
3.10 (d, J = 6.4 Hz, 2 H), 3.90
(dd, J = 13.5, 6.2 Hz, 1 H),
3.97 (dd, J = 13.5, 4.0 Hz,
1 H), 4.30 (m, 1 H), 6.80-7.35 (m, 9 H), 7.60 (d, J = 8.1 Hz, 1 H), 8.10 (br s,
1 H, NH); EIMS m/z: 267 (M+);
Anal. Calcd for C17H17NO2 (267.32):
C, 76.38; H, 6.41; N, 5.24. Found: C, 76.41; H, 6.43; N, 5.30.