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General procedure: To a solution of isatin 1 (1 mmol) in toluene (5 mL) was added the solution of trialkyl/aryl Al 2 (2 mmol, 2 M in toluene) dropwise at RT. Then the mixture was heated at 70 C and stirred for additional 3-3.5 h (see Table 2). The reaction was monitored by TLC. After completion of the reaction, toluene was evaporated and extracted with ethyl acetate (3 × 5 mL). The combined organic layer was washed with brine solution, dried over anhydrous Na2SO4, and concentrated under reduced pressure (rotary evaporator). The crude products were purified by silica gel column chromatography using ethyl acetate/hexanes (4:1-1:1). All compounds were characterized by (MP, NMR, Mass, and IR) spectral data.18
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Reference:
Article; Kumar, G. Santosh; Ramesh, Palakuri; Kumar, A. Sanjeeva; Swetha; Meshram; Tetrahedron Letters; vol. 54; 37; (2013); p. 5048 – 5051;,
Indoline – Wikipedia,
Indoline | C8H9N – PubChem