溶于甲醇:近乎透明
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
α-氰基肉桂酸 | 2-cyano-3-phenylacrylic acid | 1011-92-3 | C10H7NO2 | 173.171 |
亚苯甲基丙二酸二乙酯 | diethyl benzalmalonate | 5292-53-5 | C14H16O4 | 248.279 |
亚苄基丙二酸二甲酯 | dimethyl 2-benzylidenepropanedioate | 6626-84-2 | C12H12O4 | 220.225 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
α-氰基肉桂酸 | 2-cyano-3-phenylacrylic acid | 1011-92-3 | C10H7NO2 | 173.171 |
We have succeeded in the visible light-mediated synthetic use of α-aminoalkyl radicals derived from α-silyl secondary amines toward addition to α,β-unsaturated carbonyl compounds. The resulting γ-aminocarbonyl compounds are converted into γ-lactams and pyrroles in a one-pot process.
Physical mixtures of alkali and earth alkali metal carbonates and commercially available zeolites were investigated as solid catalysts for the Knoevenagel condensation. Best results for the model reaction between benzaldehyde and ethyl cyanoacetate were obtained for a 1:4 mixture of Na2CO3 with 4 Å molecular sieves (MS). The effects of the following parameters were investigated: structure of substrate, type and basicity of metal carbonate and zeolite, and temperature. Between 50 and 90°C chemical yields up to >90% were obtained without continuous removal of water and with reasonable catalyst activities and reaction times. Na2CO3 MS 4 Å proved to be active for the condensation of several aldehydes and ketones with a variety of active methylene components.Key words: Knoevenagel condensation, solid basic catalysts, zeolite sodium carbonate mixtures.