TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The protecting of indoline with benzyl group is performed using benzyl chlorine or benzyl bromine in N,N-dimethyl formamide as solvent, in the presence of potassium carbonate at 60-120 degrees C for 2-4 hours, to form substituted indole. The molar ratio of indoline, benzyl chlorine or benzyl bromine, and potassium carbonate is 1:1.0-1.5:1.0-1.5. The formylation reaction is Vilsmeier-Haack formylation reaction which is performed by dripping N,N-dimethyl formamide in phosphorus oxychloride at -10 degrees C to 5 degrees C, heating the reaction mixture to 60-120 degrees C, reacting with substituted indole for 3-10 hours, to obtain indole carbaldehyde. The molar ratio of substituted indole and phosphorus oxychloride is 1:1-3. The condensation is performed by reacting indole carbaldehyde with N-butoxycarbonyl-N-methylmethanesulfonamide in anhydrous tetrahydrofuran in presence of sodium tert-butoxide or potassium tert-butoxide at -78 degrees C for 5-10 hours, to obtain indole compound. The molar ratio of indole carbaldehyde, sodium tert-butoxide or potassium tert-butoxide and N-butoxycarbonyl-N-methylmethanesulfonamide is 1:1-4:1-1.5. The butoxycarbonyl-N-methylmethanesulfonamide is obtained by reacting N-methyl methanesulfonamide and tert-butoxy formic anhydride in dichloromethane in presence of 4-dimethylamino pyridine at 5-40 degrees C for 4-6 hours. The molar ratio of N-methyl methanesulfonamide, 4-dimethylamino pyridine and tert-butyloxy formic anhydride is 1:0.01-0.05:1.0-1.5. The hydrogenation is performed using palladium/carbon catalyst in solvent chosen from methanol, ethanol, ethyl acetate or tetrahydrofuran at 20-80 degrees C for 3-12 hours. The oxidization reaction is performed using manganese dioxide as oxidizing agent in dichloroethane, ethyl acetate, methanol or ethanol as solvent at 5-50 degrees C for 5-10 hours. SPECIFIC COMPOUNDS - 4 Indoline compounds are specifically claimed i.e. N-methyl-1H-benzyl-1-indoline-5-ethylene sulfamide of formula (Ia), N-methyl-1H-indoline-5-ethylene sulfamide, N-methyl-1H-indoline-5-ethyl sulfamide and N-methyl-1-benzyl-indoline-5-ethyl sulfamide.