1-AMINOINDOLINE synthesis

Yield:7633-56-9 37%

Reaction Conditions:

with potassium carbonate;hydroxylamine-O-sulfonic acid in water;acetonitrile;

Steps:

R.3 Synthesis of 1-aminoindoline

REFERENCE EXAMPLE 3: Synthesis of 1-aminoindoline In 40 ml of water was dissolved 2.76 g(20 mmol) of potassium carbonate thoroughly, and 10 ml of acetonitrile and 2.24 ml(20 mmol) of indoline were added thereto in this order. After stirring the reaction mixture for 10 min, 2.26 g(20 mmol) of hydroxylamine-O-sulfonic acid was added thereto. After stirring at room temperature for 1.5 hours, the reaction mixture was concentrated under the reduced pressure. The concentrate was extracted with dichloromethane and treated with anhydrous magnesium sulfate. After filtration, the filtrate was concentrated under the reduced pressure, and the resulting concentrate was subjected to chromatography over silica gel using dichloromethane as an eluent. The fractions were concentrated to give 0.99 g of the desired compound(37%). Rf=0.17 (in dichloromethane) NMR (DMSO-d₆, δ) 2.73~3.06 (m, 2H, --CH₂ --), 3.25~3.68 (m, 2H,NH₂) 4.10~6.3 (br, 2H, N--CH₂ --), 6.71~7.01 (m, 2H) 7.02~7.29 (m, 2H)

References:

US5336673,1994,A