Highly Selective Allylation of Alkyl Methyl Ketones in the Presence of Chiral 2-Amino Alcohol Derivatives
作者:Lutz F. Tietze、Christoph Wegner、Christian Wulff
DOI:10.1002/(sici)1099-0690(199808)1998:8<1639::aid-ejoc1639>3.0.co;2-w
日期:1998.8
2-amino alcohol derivatives 2a–p by reaction with allylsilane 3 and a catalytic amount of TfOH to give the tertiary homoallylic ethers 8a–o and 9a–e is described. The best results were obtained with the 2-amino alcohol derivative 2p which affords a stereoselectivity of 18:1 even for the allylation of ethyl methyl ketone. The ethers 8 and 9, which contain a phenyl group at C-1 of the amino alcohol moiety
描述了在手性 2-氨基醇衍生物 2a-p 存在下,通过与烯丙基硅烷 3 和催化量的 TfOH 反应,烷基甲基酮 1a-f 的面部选择性烯丙基化,得到叔均烯丙基醚 8a-o 和 9a-e . 最好的结果是用 2-氨基醇衍生物 2p 获得的,即使对于乙基甲基酮的烯丙基化,它也提供 18:1 的立体选择性。在氨基醇部分的C-1处含有苯基的醚8和9可以通过在液氨中用钠或锂还原而裂解得到相应的高烯丙醇5。