[O:1]1[C:5]2[CH:6]=[CH:7][C:8]([CH2:10][CH:11]3[C:16](=O)[NH:15][CH2:14][CH2:13][N:12]3[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=[CH:9][C:4]=2[O:3][CH2:2]1.[H-].[Al+3].[Li+].[H-].[H-].[H-].[OH-].[K+]>O1CCCC1>[O:1]1[C:5]2[CH:6]=[CH:7][C:8]([CH2:10][CH:11]3[CH2:16][NH:15][CH2:14][CH2:13][N:12]3[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=[CH:9][C:4]=2[O:3][CH2:2]1Dissolving 2.00 g of 2-benzo[1,3]dioxol-5-ylmethyl-1-tert-butoxycarbonyl-3-oxopiperazine as synthesized in the above step in 50 ml of tetrahydrofuran, 1.00 g of lithium aluminium hydride was added to the solution which then was heated under reflux for 16 hours. To the solution 10% aqueous potassium hydroxide solution was added, the insoluble matter was filtered off, extracted with ethyl acetate, the extract was dried over anhydrous magnesium sulfate and the solvent was distilled off under reduced pressure. The residue was purified on silica gel column chromatography (methanol:chloroform=1:19) to provide 1.27 g (66%) of 2-benzo[1,3]dioxol-5-ylmethyl-1-tert-butoxycarbonylpiperazine.
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