The Michaelreaction of various nitroalkanes 1 with electrophilic alkenes 2 can be performed in NaOH (0.025−0.1 M), without any organic solvent. In many cases the presence of cetyltrimethylammonium chloride (CTACl), as cationic surfactant, produces better results. Good yields of the products 3 are obtained even with hindered, and functionalized starting materials.
The N,N-diethylpropylamine supported on amorphous silica (KG-60-NEt2) catalyses the formation of carbon-carbon bonds by nitroalkanes through both the nitroaldol (Henry) and Michael reactions. The catalyst shows general utility with a variety of electrophilic acceptors. Moreover, the catalyst can be reused for two further cycles without loss of the activity. (C) 2003 Published by Elsevier Science Ltd.
Galons, Herve; Labidalle, Serge; Miocque, Marcel, Phosphorus and Sulfur and the Related Elements, 1988, vol. 39, p. 73 - 78
作者:Galons, Herve、Labidalle, Serge、Miocque, Marcel、Ligniere, Beatrice、Bram, Georges