Ethyl Acetate → 1,1-Dimethylethyl hexahydro-4-oxo-1,1-diphenylpyrazino[2,1-c][1,4]oxazine-8(1H)-carboxylate

Reaction equation

Cl[CH2:2][C:3]([N:5]1[CH2:10][CH2:9][N:8]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:7][CH:6]1[C:18]([OH:31])([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)=[O:4].[H-].[Na+].C(OCC)(=O)C>O1CCCC1>[O:4]=[C:3]1[CH2:2][O:31][C:18]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)([C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)[CH:6]2[CH2:7][N:8]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:9][CH2:10][N:5]12