1.1
Reagents:
1,1′-Carbonyldiimidazole
,
Hydrazine hydrate (1:1)
Solvents:
Tetrahydrofuran
;
1 h, rt; 6 h, rt
1.2
Catalysts:
Sodium methoxide
Solvents:
Methanol
;
1 h, rt
1.3
rt → reflux; reflux → rt
1.4
rt → 200 °C

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