The imine (5), on treatment with 2-chloroethyl chloroformate in the presence of di-isopropylethylamine, followed by heating at 140 °C gave (6), which was converted into 1,12b-didehydrolycorane to prove the stereochemistry of (6).
G. Hwang and P. Magnus, J. Chem. Soc., Chem. Commun., 1983, 693 DOI: 10.1039/C39830000693
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