Acyclic Remote 1,5- and 1,4,5-Stereocontrol in the Catalytic Stereoselective Reactions of β-Lactams with Aldehydes: The Effect of the<i>N</i>-Methylimidazole Ligand
作者:Paulina Plata、Urszula Klimczak、Bartosz K. Zambroń
DOI:10.1021/acs.joc.8b02333
日期:2018.12.7
N-methylimidazole (N-MI) ligand in the Pd(0)/InI-promoted allylations of aldehydes with β-lactam-derived organoindiums enables the reaction of azetidin-2-ones with diversely substituted allyl moieties, inert under previously reported conditions. As a result, allylations and crotylations of a variety of aromatic and aliphatic aldehydes with previously unavailable chiral ε-amido-allylindiums bearing α-, β-
所述的应用Ñ甲基咪唑(Ñ -MI)配体在钯(0)/ INI-推进与β内酰胺衍生的organoindiums醛的烯丙基化使的反应氮杂环丁烷-2-酮与不同地取代的烯丙基部分,惰性下先前报告的状况。结果,开发了多种芳香族和脂肪族醛与先前不可用的带有α-,β-或γ-取代的烯丙基片段的手性ε-酰胺基烯丙基的烯丙基化和丁烯酰化。反应在热力学控制下进行,高效的远程1,5-或1,4,5-立体控制可提供(3 Z)-2,5-抗-2,6- syn-或(3 Z)的多样性-2,5-辛-2,6-抗-取代的烯二醇,氨基醇和均烯丙基醇,产率中等至高,且具有非对映选择性。详细研究了β-内酰胺和醛的结构和手性对产物收率和立体化学的影响。