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Formation of pyrrolopyrazinone 31 under various conditions. Conditions: (a) Sc(OTf)3, H2O, CH3CN, 23 °C [(±)-30: 36%, 31: <5%]; (b) EtSH, TFA, CH2Cl2, 23 °C [(±)-32: 95%]; (c) CH2Cl2, TFA, 23 °C, 95%; (d) NaIO4, MeOH, H2O, 23 °C, 55%; (e) MeCN, 79 °C, 100 %.
