Direct generation of lithium homoenolates from 3-aryl α,β-unsaturated ketones or esters by an arene-catalysed lithiation: Synthesis of substituted tetrahydrofurans and γ-butyrolactones
作者:Emma Alonso、Diego J. Ramón、Miguel Yus
DOI:10.1016/s0040-4020(96)01155-6
日期:1997.2
The reaction of α,β-unsaturated ketones 1 with an excess of lithium powder, a catalytic amount of naphthalene (4 %) and different carbonyl compounds in the presence of boron trifluoride in THF at −78 – 0°C yields, after treatament with silyl nucleophile and final hydrolysis, the expected substituted tetrahydrofurans 5. Similar methodology applied to β-aryl acrylic esters 6, but without using boron trifluoride
α-β-不饱和酮1与过量的锂粉,催化量的萘(4%)和不同的羰基化合物在三氟化硼存在下于THF中在-78 – 0°C下反应,用•甲硅烷基亲核试剂和最终水解,预期取代的四氢呋喃5。将类似的方法应用于β-芳基丙烯酸酯6,但不使用三氟化硼或甲硅烷基试剂,则可得到相应的内酯7。