To a stirring solution of methyl-[1-(S)-phenyl-2-pyrrolidin-1-yl-ethyl]-amine in acetonitrile (0.3 M) at 0° C. under nitrogen was added diisopropylethylamine (2.2 eq), 6a (1.1 eq) and O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TBTU) (1.1 eq). The reaction was stirred at room temperature overnight. The acetonitrile was removed under reduced pressure. The remaining oil was partitioned between ethyl acetate and saturated sodium bicarbonate. The phases were separated and the organic phase was washed with saturated sodium bicarbonate (2×), brine (1×), dried over sodium sulfate, filtered, concentrated in vacuo and purified by flash chromatography using the ISCO (1-15% gradient methanol/dichloromethane) to afford the product. (65%) 1H NMR (400 MHz, CDCl3) δ 7.29 (m, 9H), 6.21 (m, 1H), 5.62 (m, 1H), 4.31 (m, 2H), 3.95 (m, 1H), 3.71 (m, 1H), 3.05 (m, 1H), 2.82 (m, 5H), 2.55 (m, 2H), 1.85 (m, 5H), 1.46 (s, 9H). Mass Spectral Analysis m/z=452.3 (M+H)+ tR=4.92 min (96%)
