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To R7 (25.0 g, 111 mmol) in acetonitrile (750 mL) is added MeI (15 mL, 241 mmol) and K2CO3 (60.0 g, 434 mmol) and the reaction mixture is stirred at 60 C. for 2 h. The reaction mixture is filtered and concentrated. Water and ethyl acetate are added to the residue. The organic layer is extracted twice with water, dried over MgSO4 and concentrated. Yield 56%, m/z 240/242 [M+H]+, rt 0.48 min, LC-MS Method X001-004.
The chemical industry reduces the impact on the environment during synthesis 6-Bromoisatin. I believe this compound will play a more active role in future production and life.
Reference:
Patent; BOEHRINGER INGELHEIM INTERNATIONAL GMBH; GRAUERT, Matthias; ANDERSKEWITZ, Ralf; GRUNDL, Marc; OOST, Thorsten; PAUTSCH, Alexander; PETERS, Stefan; US2014/275155; (2014); A1;,
Indoline – Wikipedia,
Indoline | C8H9N – PubChem