1.1
Solvents:
Dimethylformamide
;
overnight, 130 °C; 130 °C → rt
1.2
Reagents:
Pyridine
,
Hydroxylamine-O-sulfonic acid
Solvents:
Methanol
;
cooled; overnight, rt
1.3
Reagents:
Sodium bicarbonate
Solvents:
Ethyl acetate
,
Water
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