[NH2:1][C:2]1[CH:10]=[C:9]2[C:5]([CH2:6][NH:7][C:8]2=[O:11])=[CH:4][CH:3]=1.[I-].[Na+].Br[CH2:15][CH2:16][CH2:17][CH2:18][CH2:19]Br.C(N(C(C)C)C(C)C)C>C(#N)C>[N:1]1([C:2]2[CH:10]=[C:9]3[C:5]([CH2:6][NH:7][C:8]3=[O:11])=[CH:4][CH:3]=2)[CH2:19][CH2:18][CH2:17][CH2:16][CH2:15]16-Amino-2,3-dihydro-isoindol-1-one (0.810 g, CAS 675109-45-2) was dissolved in 12 ml of acetonitrile and treated successively with sodium iodide (2.458 g, 3 eq.), 1,5-dibromopentane (1.11 ml, 1.5 eq.), and N-ethyl-diisopropylamine (2.88 ml, 3.1 eq.), and the mixture was stirred at 75° C. for 20 h. Pouring onto crushed ice, twofold extraction with AcOEt, washing with water and brine, drying over magnesium sulfate, and evaporation of the solvents, followed by crystallization from hexane/ethyl acetate yielded 6-piperidin-1-yl-2,3-dihydro-isoindol-1-one (0.669 g) as light brown crystals, MS 217.3 ([M+H]+).
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