Aminolysis of readily accessible β-diethoxyphosphonyl-γ-butyrolactones 5 and 22 provides a convenient entry to (E)-β,γ-unsaturated amides 8 and 24 respectively. The key step of the aminolysis involves elimination of diethoxyphosporic acid from the corresponding β-hydroxyalkylphosphonates 7 and 23. Stereochemistry of the amides 8 and 24 results from their consecutive base catalyzed isomerization.
容易获得的β-二乙氧基膦酰基-
γ-丁内酯5和22的
氨解分别方便地进入(E)-β,γ-不饱和酰胺8和24。
氨解的关键步骤涉及从相应的β-羟烷基
膦酸酯7和23中消除二乙氧基
磷酸。酰胺8和24的立体
化学是由它们连续的碱催化的异构化产生的。