An unexpected 1,2-hydride shift in phosphoric acid-promoted cyclodimerization of styrene oxides under solvent-free conditions. A synthetic route towards 2,4-disubstituted 1,3-dioxolanes
作者:Ofentse Mazimba、Runner R. Majinda、Ishmael B. Masesane
DOI:10.1016/j.tetlet.2009.08.044
日期:2009.10
A 1,2-hydride shift in the phosphoric acid-promoted cyclodimerization of styrene oxide and its chloro derivatives under solvent-free conditions leading to 2,4-disubstituted 1,3-dioxolanes is described. Methoxy substituents on the aromatic ring of the styrene oxide prevent the 1,2-hydride shift reaction leading to substituted 1,4-dioxanes. A possible mechanism for the formation of the 1,3-dioxolanes
描述了在无溶剂条件下磷酸促进的苯乙烯氧化物及其氯衍生物的环二聚反应中的1,2-氢化物移位,从而导致2,4-二取代的1,3-二氧戊环。氧化苯乙烯的芳环上的甲氧基取代基可防止1,2-氢化物转移反应,从而导致取代的1,4-二恶烷。提出了一种可能的机制,以形成1,3-二氧戊环。