Avoiding Olefin Isomerization During Decyanation of Alkylcyano α,ω-Dienes: A Deuterium Labeling and Structural Study of Mechanism
作者:Giovanni Rojas、Kenneth B. Wagener
DOI:10.1021/jo800640j
日期:2008.7.1
pathway involving decyanation chemistry for the synthesis of pure alkyl α,ω-dienes in quantitative yields is presented. Prior methodologies for the preparation of such compounds required 6−9 steps, sometimes leading to product mixtures resulting from olefin isomerization chemistry. This isomerization chemistry has been eliminated. Deuteration labeling and structural mechanistic investigations were completed
提出了一种涉及脱氰化学的两步合成途径,以定量收率合成纯烷基α,ω-二烯。用于制备此类化合物的现有方法学需要6-9个步骤,有时会由于烯烃异构化化学反应而产生产物混合物。消除了这种异构化化学反应。完成氘化标记和结构机理研究以破译这种化学反应。氘标记实验揭示了这种自由基脱氰化学的精确性质,其中醇起着氢供体的作用。本文报道了避免竞争性分子内环化的正确分子设计,以及在脱氰过程中避免烯烃异构化的必要反应条件。