The utility of the 1,3-Michael–Claisen annulation sequence in the synthesis of natural products has been demonstrated by the synthesis of sophorapterocarpan A (1), maackiain (2), and anhydropisatin (3).
Y. Ozaki, K. Mochida and S. Kim, J. Chem. Soc., Chem. Commun., 1988, 374 DOI: 10.1039/C39880000374
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