[reaction: see text]. The total synthesis of the potent immunosuppressant FR901483 is described. In a key step, the intermolecular Diels-Alder cycloaddition of an amidoacrolein with 2-(triisopropylsilyloxy)-1,3-butadiene produced the desired 3-cyclohexene-1-carboxaldehyde. This compound was subjected to basic followed by acidic conditions which effected two sequential aldol cyclizations to deliver
[反应:请参见文字]。描述了有效的
免疫抑制剂FR901483的总合成。在关键步骤中,
氨基
丙烯醛与2-(
三异丙基甲
硅烷氧基)-
1,3-丁二烯的分子间狄尔斯-阿尔德环加成反应产生了所需的3-
环己烯-1-羧醛。使该化合物经受碱性,然后经受酸性条件,该酸性条件实现了两个连续的醛醇环化,以递送
天然产物的
三环体系,其适当官能化以完成总合成。