[H-].[Al+3].[Li+].[H-].[H-].[H-].C[O:8][C:9]([C:11]1([O:23][CH3:24])[CH2:15][CH2:14][N:13]([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[CH2:12]1)=O.O.[OH-].[K+]>C(OCC)C>[CH2:16]([N:13]1[CH2:14][CH2:15][C:11]([CH2:9][OH:8])([O:23][CH3:24])[CH2:12]1)[C:17]1[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=16.5 g Lithium aluminum hydride are suspended in 250 ml of dry diethylether. 42 g (0.16 mol) 1-benzyl-3-methoxypyrrolidine-3-carboxylic acidmethylester are added dropwise. The mixture is stirred for 2 hours under reflux. Thereafter 6.5 ml of water, 6.5 ml 15% proof KOH and 6.5 ml of water are added, the inorganic salts are removed by filtration and washed twice with tetrahydrofurane. The organic solvents are removed from the filtrate in vacuo and the resedue is destilled.
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