Synthesis of (3,4) β-Methylenecepham and (3,4) β-Methylene-carbacepham via intramolecular carbene addition to double bond
Bioorganic & Medicinal Chemistry, Volume 11, Issue 9, 1 May 2003, Pages 1957-1967
Anna Korda, Jerzy Winiarski
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http://dx.doi.org/10.1016/S0968-0896(03)00084-1