1,4-Addition of diorganocuprates to the α,β-unsaturated esters (1)–(5) gave the Oxapropellane skeleton, compounds (6)–(10), in a one-pot reaction, which proceeded via 1,4-addition, aldol condensation, and substitution.
C. Fang, K. Suganuma, H. Suemune and K. Sakai, J. Chem. Soc., Perkin Trans. 1, 1990, 1483 DOI: 10.1039/P19900001483
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