The synthesis of (±)-(2), an A ring model for 1α,25-dihydroxyvitamin D3 has been achieved in 7 steps from ethyl acetoacetate, with an acyl radical cyclization as the key ring forming step.
D. Batty, D. Crich and S. M. Fortt, J. Chem. Soc., Chem. Commun., 1989, 1366 DOI: 10.1039/C39890001366
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