The indolizidone 9, the pyrrolizidone 14, a mixture of heliotridone 15a and pseudoheliotridone 15b and the lactam 19 have been synthesized in a one-step anthraquinone-photocatalysed reaction of the corresponding amines, piperidine 1, pyrrolidine 10 and morpholine 16, with α,β-unsaturated esters.
S. Das, J. S. D. Kumar, K. Shivaramayya and M. V. George, J. Chem. Soc., Perkin Trans. 1, 1995, 1797 DOI: 10.1039/P19950001797
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