1: piperidine; 5-bromo-2-furancarboxaldehyde With triethylamine in 1,4-dioxane; water 4 h; Heating; 2: N-phenyl-maleimide With magnesium sulfate in 1,4-dioxane; water Diels-Alder reaction; 18 h; Heating; Further stages.;
Samuilov, Ya. D.; Movchan, A. I.; Solov'eva, S. E.; Konovalov, A. I.
Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, p. 1985 - 1988
Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 10 p. 2179 - 2182