A new approach to steroid ring construction based on sequential cascade 6-endo-trig cyclisation/macrocyclisation/transannulation reactions and exemplified in the synthesis of the cis, anti, cis, anti, cis tetracycle 17 from 15, is presented.
S. Handa and G. Pattenden, Chem. Commun., 1998, 311 DOI: 10.1039/A707320H
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