Aldol additions of pinacolone lithium enolate with ketones: reactivities governed predominantly by field effects
作者:Goutam Das、Edward R. Thornton
DOI:10.1021/ja00057a012
日期:1993.2
The relative reactivities of representative α- and β-heterosubstituted acyclic, cyclic (five- and six-membered), and aromatic ketones with the lithium enolate of pinacolone in diethyl ether at -78 o C were determined. The order of reactivitiesof monosubstituted acetones (MeCOCH 2 X) is X=Cl>OTBDMS>OMe>SMe>NMe 2 >CH 2 SM>H>Me and spans a range of 10 4
测定了代表性的 α- 和 β- 杂取代的无环、环状(五元和六元)和芳香酮与频哪酮的烯醇锂在 -78 o C 的二乙醚中的相对反应性。单取代丙酮 (MeCOCH 2 X) 的反应性顺序为 X=Cl>OTBDMS>OMe>SMe>NMe 2 >CH 2 SM>H>Me,范围为 10 4