Hydroxylamine → N-hydroxy-3-(2'-oxo-6H-spiro[benzofuro[6,5-d][1,3]dioxole-7,3'-indoline]-1'-yl)propanimidamide
Reaction equation
[O:1]=[C:2]1[C:10]2([C:14]3=[CH:15][C:16]4[O:20][CH2:19][O:18][C:17]=4[CH:21]=[C:13]3[O:12][CH2:11]2)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[N:3]1[CH2:22][CH2:23][C:24]#[N:25].[NH2:26][OH:27]>CS(C)=O>[OH:27][N:26]=[C:24]([NH2:25])[CH2:23][CH2:22][N:3]1[C:4]2[C:9](=[CH:8][CH:7]=[CH:6][CH:5]=2)[C:10]2([C:14]3=[CH:15][C:16]4[O:20][CH2:19][O:18][C:17]=4[CH:21]=[C:13]3[O:12][CH2:11]2)[C:2]1=[O:1]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To a stirred solution of 3-(2′-oxo-6H-spiro[benzofuro[6,5-d][1,3]dioxole-7,3′-indoline]-1′-yl)propanenitrile (2.00 g, 6.0 mmol) in dimethyl sulfoxide (15.0 mL) was added hydroxylamine (50% wt solution in water, 1.6 mL, 24 mmol). The reaction was stirred at ambient temperature for 16 h, then the product was precipitated upon addition of water/ethanol (3:1, 100 mL). The solvent was decanted and the remaining solid was triturated in distilled water (75 mL). The solid was filtered and air-dried to afford N′-hydroxy-3-(2′-oxo-6H-spiro[benzofuro[6,5-d][1,3]dioxole-7,3′-indoline]-1′-yl)propanimidamide as a colorless solid (2.00 g, 91%): MS (ES+) m/z 368.2 (M+1).