π-Facial Diastereoselection in the 1,2-Addition of Allylmetal Reagents to 2-Methoxycyclohexanone and Tetrahydrofuranspiro-(2-cyclohexanone)
作者:Leo A. Paquette、Paul C. Lobben
DOI:10.1021/ja9536835
日期:1996.1.1
stereochemical course of the 1,2-addition of several allylmetal reagents and of the Normant Grignard [ClMgO(CH2)3MgCl] to 2-methoxycyclohexanone and tetrahydrofuranspiro-(2-cyclohexanone) has been determined. In four of the six substrates examined, a 4-tert-butyl group is present to serve as a conformational anchor. The neighboring methoxyl substituent is shown to be capable of engaging effectively in
已经确定了几种烯丙基金属试剂和 Normant Grignard [ClMgO(CH2)3MgCl] 的 1,2-加成到 2-甲氧基环己酮和四氢呋喃螺-(2-环己酮) 的立体化学过程。在检测的六种底物中的四种中,存在一个 4-叔丁基作为构象锚。相邻的甲氧基取代基显示出能够有效参与螯合,尽管特殊情况可能另有规定。涉及烯丙基试剂作为水溶液中的亲核试剂的实验表明,水的存在不会抑制螯合控制的操作,这通常大大超过在无水介质中使用相应的镁、铈和铬试剂所能达到的效果。