(2S)-N-[2-(1H-indol-3-yl)-ethyl]-3-methyl-2-(methylamino)butanamide 在
盐酸 、 (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 作用下,
以
乙酸乙酯 为溶剂,
生成 (3S,12bS)-12b-benzyl-3-isopropyl-2-methyl-2,3,6,7,12,12b-hexahydro-pyrazino[1',2':1,2]pyrido[3,4-b]indole-1,4-dione