RT journal article T1 Synthesis of the western half of breviones C, D, F and G A1 Macías Domínguez, Francisco Antonio A1 Carrera Fernández, Ceferino Adrián A1 Chinchilla Salcedo, Nuria A1 R. Fronczek, Frank A1 García Galindo, Juan Carlos A2 Química Orgánica K1 Brevianes K1 abeo-Brevianes K1 Tiffeneau–Demjanov K1 Ring expansion AB The enantioselective synthesis of the diterpenic moiety in the abeo-breviano skeleton is reported. Thesynthesis is carried out starting from 2-methyl-1,3-cyclohexanedione and EVK in eleven steps followinga ring-expansion strategy once the tricyclic perhydrophenantrene skeleton has been obtained. A newTiffeneau–Demjanov rearrangement under dark conditions is reported in which the insertion of the newmethylene group is directed towards the most hindered side of the carbonyl group. This result is new andopposite to those reported in the literature under light (filtered or un-filtered wavelengths) conditionswhere insertion in the less hindered side is usually preferred. PB Elsevier SN 0040-4020 YR 2010 FD 2010 LK http://hdl.handle.net/10498/30358 UL http://hdl.handle.net/10498/30358 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 04-nov-2026