[I:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][CH:6]=[C:5]2[C@H:11]1[CH2:15][CH2:14][CH2:13][C@@H:12]1[CH:16]=O.[CH3:18][NH:19][CH3:20].C(O)(=O)C.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>CO.C1COCC1>[I:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][CH:6]=[C:5]2[C@@H:11]1[CH2:15][CH2:14][CH2:13][C@H:12]1[CH2:16][N:19]([CH3:20])[CH3:18]
To a room temperature solution of (1S,2S)-2-(5-iodo-1H-indol-3-yl)-cyclo-pentanecarbaldehyde (17.5 g, 51.6 mMol) in 200 mL of methanol was added with stirring dimethylamine (64 mL of a 2.0 M solution in THF, 128 mMol) followed by acetic acid (0.5 mL). After 15 min, NaBH(OAc)3 (12 g, 57 mMol) was added slowly. The resulting mixture was stirred 18 h and was then concentrated under vacuum. The residue was partitioned between ethyl acetate (400 mL) and aqueous NaHCO3 (300 mL). The organic layer was washed twice with aqueous NaHCO3 (250 mL). Every aqueous layer was extracted with ethyl acetate (50 mL) to make sure no product was left in aqueous. The combined organic extracts were then dried over MgSO4. Solvent was removed under vacuum and the residue was pump dried overnight to give crude trans [2-(5-iodo-1H-indol-3-yl)-cyclopentylmethyl]-dimethylamine (19.4 g, 100%) which was used directly for the next reaction without further purification. An analytical sample was prepared by crystallization from ethyl acetate. 1H NMR (400 MHz, methanol-d4) δ 7.86 (s, 1H), 7.30 (d, 1H), 7.14 (d, 1H), 7.02 (s, 1H), 2.80 (m, 1H), 2.27 (m, 3H), 2.12 (s, 6H), 2.10 (m, 2H), 1.79 (m, 3H), 1.46 (m, 1H); 13C NMR (400 MHz, methanol-d4), δ 137.6, 131.1, 130.5, 128.9, 123.2, 119.0, 114.6, 82.3, 66.2, 46.0, 45.6, 43.4, 35.0, 33.0, 25.2; HRMS (EI), exact mass calc'd for C16H21IN2 (M+H) 369.0828, found 369.0836.
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