[CH:1]([O:4][C:5]1[C:10]([C:11]#[N:12])=[CH:9][CH:8]=[C:7]([CH3:13])[N:6]=1)([CH3:3])[CH3:2].C1COCC1.[H-].[H-].[H-].[H-].[Li+].[Al+3].O>CCOCC>[CH:1]([O:4][C:5]1[C:10]([CH2:11][NH2:12])=[CH:9][CH:8]=[C:7]([CH3:13])[N:6]=1)([CH3:3])[CH3:2]The nitrile 32a (1.25 g, 7.12 mmol) solubilized in Et2O (20 mL) and THF (10 mL) was added in small portion to a mixture of LiAlH4 (0.54 g, 2 mol eq) in Et2O (50 mL) stirred at 0° C. Then the mixture was stirred at room temperature overnight. The excess of LiAlH4 was decomposed by water addition at 0° C., the solid formed was filtered, washed with Et2O and the filtrate was separated. The organic phase was anhydrified over Na2SO4 and evaporated to dryness to obtain 33a as yellow oil (1.14 g, 6.35 mmol, 89% Yield) used without further purification.
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