Alkylation of regioisomeric potassium enolates 4 and 6 obtained from corresponding silyl enol ethers 2 and 3 occurs at the most substituted site affording ketones 8. Alkylation of corresponding lithium enolates 5 and 7 occurs at the expected site affording ketones 8 or 9. As an application the one pot synthesis of spiroketones 13 from silyl enol ethers 12 is described.
由相应的
硅烷基烯醇醚 2 和 3 生成的烯醇
钾 4 和烯醇
钾 6 在取代度最高的位点发生烷基化反应,生成酮 8。相应的烯醇
锂盐 5 和 7 在预期部位发生烷基化反应,生成酮 8 或酮 9。作为应用,描述了从
硅基烯醇醚 12 一锅合成螺酮 13 的过程。