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General Procedure To a stirred solution of amine 2 (1.00 equiv) in MeCN (0.5 mL/mmol) was added dropwise at 0°C AlMe3 (2.00 M in toluene, 2.00 equiv, then In(OTf)3 (4-25 mol, and the ester 3 (1.00 equiv, and stirring was continued for 3-17 h at r.t. or the mixture was heated to 100-180°C under microwave irradiation. The reaction mixture was cooled to 0°C, TfOH (3.5 equiv) was added dropwise and stirring was continued for 5 h at r.t. Subsequently, the mixture was quenched by addition of sat. aq NaHCO3 at 0°C with stirring for 20 min. The mixture was extracted with EtOAc, the combined organic layers were washed with brine, dried over Na2SO4, and the solvent was removed under reduced pressure. The crude product was subjected to column chromatography to yield 38-99% of the spirocycle 4. Compound 4a: 1H NMR (300 MHz, DMSO, δ, 1.35-1.60 m, 5 H, 3-H2, 2-H2
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a, 8a-H), 2.39-2.48
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