1.1
Reagents:
Sodium hydride
Solvents:
Dimethyl sulfoxide
;
30 min, rt; 30 min, rt
1.2
Solvents:
Dimethyl sulfoxide
;
2 h, 120 °C
1.3
Reagents:
Ammonium chloride
Solvents:
Water
;
cooled
1.4
Reagents:
p-Toluenesulfonic acid
Solvents:
Acetonitrile
;
1 h, reflux

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