Synthesis of (E)-1-Propenyl Ketones from Carboxylic Esters and Carboxamides by Use of Mixed Organolithium-Magnesium Reagents. Synthesis of ?-Damascone, ?-Damascone, and ?-Damascenone
作者:Charles Fehr、Jos� Galindo
DOI:10.1002/hlca.19860690127
日期:1986.2.5
The novel reagents formed by combination of allylmagnesium chloride and a strong non-nucleophilic lithium base (LiNR2) convert non- or slowly enolizable carboxylic esters or carboxamides into 2-propenyl ketones which are protected from further reaction by their in situ conversion into enolates. This modified Grignard reaction is applied to efficient syntheses of α-damascone, β-damascone, β-damascenone
由氯化烯丙基氯化镁和强非亲核性锂碱(LiNR 2)结合形成的新型试剂将不可或缓慢可烯化的羧酸酯或羧酰胺转化为2-丙烯基酮,通过原位转化为烯醇化物可防止其进一步反应。该修饰的格氏试剂反应被用于α-大马可尼,β-大马可尼,β-大马烯酮和各种其他(E)-1-丙烯基酮的有效合成。