1.1
Reagents:
Hydrogen tribromide, compd. with 2-pyrrolidinone (1:3)
Solvents:
Tetrahydrofuran
;
30 min, reflux; reflux → rt
1.2
Reagents:
Sodium bicarbonate
Solvents:
Water
;
rt
1.3
Reagents:
Diisopropylethylamine
Solvents:
Dimethylformamide
;
1 h, rt
1.4
Reagents:
Ammonium acetate
Solvents:
Acetic acid
;
2 h, 135 - 150 °C
1.5
Reagents:
Lithium hydroxide
Solvents:
Methanol
,
Tetrahydrofuran
,
Water
;
4 h, rt
1.6
Reagents:
Hydrochloric acid
Solvents:
Water
;
pH 3
1.7
Reagents:
Diisopropylethylamine
,
O-(Benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate
Solvents:
Tetrahydrofuran
;
18 h, rt

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