Reaction of dianions derived from β-ketoesters with epoxides-utility in the preparation of synthetically useful tetrahydrofurans
作者:Barry Lygo、Norval O'connor、Peter R. Wilson
DOI:10.1016/s0040-4020(01)86217-7
日期:1988.1
that ether substituents α- or β- to an epoxide ring can be tolerated in the ring-opening reaction with β-keto ester dianions. Subsequent acid-promoted cyclisation of the γ-hydroxy β-ketoesters then leads to synthetically useful tetrahydrofurans, as demonstrated by application of this approach to the preparation of (±)-methyl nonactate and (±)-methyl 8-epi-nonactate.
在此给出的一些实施例表明,在与β-酮酸酯二价阴离子的开环反应中,环氧化物环的醚取代基α-或β-可以被容许。所述γ-β羟基酮酯然后导致合成有用的四氢呋喃的后续酸促进环化,这表现在这种方法的应用的制备(±) -甲基nonactate和(±) -甲基-8-外延-nonactate。