摘要:
                                A concise route to the core structure 1 of 6-5-6-5-6-membered epipolythiodiketopiperazines is described. The strategy relies on construction of the pyrrolines by double nucleophilic opening of a bis(oxabicyclo[2.2.1]heptene) 2, obtained after bidirectional condensation of N,N'-diacetyldiketopiperazine (4) with aldehyde 3.