The firstasymmetricsynthesis of phenanthroquinolizidine alkaloid (R)-boehmeriasin A is described. Two alternative synthetic pathways to the key intermediate (RS,R)-4 were achieved through a combination of highly diastereoselective 1,2-nucleophilic addition on (―)-(S)-1-amino-2-(methoxymethyl)pyrrolidine hydrazones with a ring-closing metathesis to ensure the construction of the piperidine template
描述了菲喹唑啶生物碱 (R)-勃姆菌素 A 的第一个不对称合成。通过对 (-)-(S)-1-氨基-2-(甲氧基甲基)吡咯烷腙进行高度非对映选择性的 1,2-亲核加成与闭环复分解,以确保哌啶模板的构建。随后的酰化/氧化/羟醛缩合/自由基环化序列完成了标题 (R) 配置的天然产物的组装。