Superbase promoted synthesis of dienamides as useful intermediates for the synthesis of α-ketoamides, γ-lactams and cyclic imino ethers
作者:Marco Blangetti、Annamaria Deagostino、Giuliana Gervasio、Domenica Marabello、Cristina Prandi、Paolo Venturello
DOI:10.1039/c0ob00867b
日期:——
Alkoxydienamides 2 have been synthesized exploiting the reactivity of α,β-unsaturated acetals 1 with isocyanates in the presence of Schlosser's superbase LICâKOR. In a mild acidic medium, 2 can then be promptly converted both into α-ketoamides 3 and into substituted 2-pyrrolidinones 4 or imino ethers 5 by choosing the appropriate experimental conditions.
利用δ,δ-不饱和乙醛 1 与异氰酸酯在 Schlosser 的超级酶 LICâKOR 存在下的反应活性,合成了烷氧基二酰胺 2。在弱酸性介质中,通过选择适当的实验条件,2 可以迅速转化为 δ-酮酰胺 3 和取代的 2-吡咯烷酮 4 或亚氨基醚 5。