作者:Bernard Delpech、Daniel Calvo、Robert Lett
DOI:10.1016/0040-4039(95)02364-x
日期:1996.2
A new total synthesis of forskolin 1 has been achieved and this note describes the synthesis of the trans fused enone 18 as a key-intermediate. Key steps are: 1) the intramolecular Diels-Alder reaction of 7 to afford the tricyclic lactone 8 (48–56%); 2) a stereospecific and regiospecific one-pot conversion of 11A into 12 (94%) with LiBH4/BF3-THF at room temperature. The scheme allows a very early stereospecific
已经完成了新的佛司可林1的全合成,该注释描述了作为键中间体的反式烯酮18的合成。关键步骤是:1)的分子内Diels-Alder反应7,得到三环内酯8(48-56%); 2)在室温下用LiBH 4 / BF 3 -THF将11 A的立体有择和区域专一性转化为12(94%)。该方案允许在很早的立体定向引入所需的1α和9αOH,以及它们在毛喉素合成结束时的特异性保护。