KHSO4-Assisted Michael Addition–Elimination Reactions of Indole with 3-Dimethylamino-1-phenylprop-2-en-1-ones in Water: An Environmentally Friendly Synthesis of Novel 3-Indolylchalcones
摘要:
KHSO4-assisted Michael addition-elimination reactions of 2-methylindoles and 1,2-dimethylindoles with 3-dimethylamino-1-phenylprop-2-en-1-ones (2) in water, leading to the formation of 3-(2-methyl-1H-indol-3-yl)-1-arylpropenones (3a-e) and 3-(1,2-dimethy-1H-lindol-3-yl)-1-arylpropenones (3f-j) respectively in good to excellent yields have been reported. However, cyclodehydration of adducts 3a-f to give carbazoles 4 failed to take place under the reaction conditions.