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Reagents and conditions: (a) AC2O, pyridine; (b) S-methyl methylaminomethanethioate, 1,4-dioxane, H2O, 65 °C; (c) diphenyl N-cyanocarbonimidate, iPrOH, 70 °C; (d) MeNH2, iPrOH, 70 °C; (e) MeSO2Cl, NaHCO3, DIPEA, CH2Cl2.
