4.1.2.2. Method B e in dichloromethane. Oximes 3 (0.54 mmol) and indole (2.16 mmol) were added to a suspension of Na2CO3 (5.4mmol) in dichloromethane (30 mL). The reactionwas stirred at room temperature, and the progress of the reaction was monitored by TLC. Upon completion (36 h), the reactionwas filtered through a
pad of Celite, which was washed with dichloromethane. The solvent was evaporated to give the crude product, which was purified by flash chromatography [eluting with ethyl acetate/hexane from (1:2) to (1:1)].