Application of a Recyclable Pseudoephedrine Resin in Asymmetric Alkylations on Solid Phase
作者:Panee C. Hutchison、Tom D. Heightman、David J. Procter
DOI:10.1021/jo0354950
日期:2004.2.1
A pseudoephedrine resin has been successfully employed in asymmetric alkylations on solid phase. Immobilized pseudoephedrine amides are conveniently prepared by the one-step attachment of pseudoephedrine to Merrifield resin through the hydroxyl group and subsequent acylation on nitrogen. Deprotonation and alkylation of the resin-bound amides proceeds smoothly. Ketones and alcohols are cleaved from
伪麻黄碱树脂已成功用于固相不对称烷基化反应中。固定的伪麻黄碱酰胺可通过将伪麻黄碱通过羟基一步一步连接到Merrifield树脂并随后在氮上酰化来方便地制备。与树脂结合的酰胺的去质子化和烷基化反应顺利进行。酮和醇以高对映异构体过量和中等至良好的总收率从树脂上裂解下来。进行了手性酮和醇的小型文库的平行,不对称固相合成,以说明该方法的实用性。最后,伪麻黄碱树脂可以方便地回收和利用,而产物的收率或对映体过量没有明显损失。