Bestmann ylide [(triphenylphosphoranylidene)ketene] acts as a chemical linchpin that links nucleophilic entities, such as alcohols or amines, with carbonyl moieties to produce unsaturated esters and amides, respectively. In this work, the formation of α,β,γ,δ-unsaturated esters (dienoates) is achieved through the coupling of Bestmann ylide, an alcohol and an α,β-unsaturated aldehyde. Primary and secondary alcohols, including allylic alcohols, are suitable substrates; the newly formed alkene has an E-geometry. Strategically, this represents a highly efficient route to unsaturated polyketide derivatives. A linchpin approach to the synthesis of a major fragment of the natural products zampanolide and dactylolide is investigated using Bestmann ylide to link the C16–C20 alcohol with the C3–C8 aldehyde fragment.
Bestmann亚磷酰基[(三苯基磷氧基)酮烯]作为一种化学枢纽,将亲核实体,如醇或胺,与羰基部分连接起来,分别生成不饱和酯和酰胺。在这项工作中,通过Bestmann亚磷酰基、醇和α,β-不饱和醛的偶联实现了α,β,γ,δ-不饱和酯(二烯酸酯)的生成。一级和二级醇,包括烯丙基醇,都是合适的底物;新形成烯烃具有E-型几何结构。策略上,这代表了一条高效合成不饱和聚酮衍生物的路线。利用Bestmann亚磷酰基将C16-C20醇与C3-C8醛片段连接起来,研究了通过枢纽法合成天然产物zampanolide和dactylolide主要片段的方法。