Dienediolates of unsaturated carboxylic acids in synthesis. Aldehydes and ketones from alkyl halides, by ozonolysis of β,γ-unsaturated α-alkyl carboxylic acids. The role of a tertiary amine in the cleavage of ozonides
作者:María JoséAurell、Luisa Ceita、Ramon Mestres、Amparo Tortajada
DOI:10.1016/s0040-4020(97)00694-7
日期:1997.8
A convenient two-step procedure for a two carbon homologative conversion of alkyl halides into aldehydes and methyl ketones by α-alkylation of unsaturated carboxylic acids, followed by ozonolysis is developed and applied to the synthesis of ω-chloro aldehydes. Triethylamine is superior to dimethyl sulfide or triphenylphosphine for cleavage of the ozonides, except when aldol condensation side reactions
开发了一种方便的两步程序,通过不饱和羧酸的α-烷基化,将卤代烷的两个碳同构转化为醛和甲基酮,然后进行臭氧分解,并将其应用于ω-氯醛的合成。除醛醇缩合副反应需要使用质子溶剂和碘化物盐的情况外,三乙胺比二甲基硫醚或三苯膦对臭氧的裂解更好。已显示三乙胺对臭氧化物的切割主要是通过还原过程发生的。