[CH3:1][C:2]1([CH3:15])[O:7][C:6]2[CH:8]=[CH:9][C:10]([C:12]#[N:13])=[CH:11][C:5]=2[C:4](=[O:14])[O:3]1.C(O)(=O)C.N#N>CO.[Pd]>[C:2]([OH:7])(=[O:3])[CH3:1].[NH2:13][CH2:12][C:10]1[CH:9]=[CH:8][C:6]2[O:7][C:2]([CH3:15])([CH3:1])[O:3][C:4](=[O:14])[C:5]=2[CH:11]=1To a solution of 2,2-dimethyl-4-oxo-4H-1,3-benzodioxine-6-carbonitrile (12 g, 0.06 mol) in methanol (500 mL) was added glacial acetic acid (3.5 g, 0.059 mol) and passed N2 for 30 min. To this was added Pd/C (2.4 g, 20%) and hydrogenated under 2 Bars of pressure for 22 h. The reaction mixture was filtered through celite and filtrate concentrated under vacuum. To the solid was added EtOAc (200 mL), stirred for 20 h and filtered. The solid was dried under vacuum to give the title compound (6 g, 38%). TLC: CHCl3/MeOH, 9:1, Rf: 0.15
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