Pd(0)-Catalyzed Intermolecular Dearomatizing [3 + 2] Spiroannulation of Phenol-Based Biaryls and Allenes
作者:Wenjie Hu、Hui Wang、Lu Bai、Jingjing Liu、Xinjun Luan
DOI:10.1021/acs.orglett.8b00014
日期:2018.2.2
Readily available phenol-derived biaryls reacted with allenes under palladium catalysis to provide a variety of highly valuable spiro[cyclohexane-1,1′-indene]-2,5-dien-4-ones. This new catalytic process, involving a key step of regioselective allylative dearomatization of phenol, proceeded efficiently through a [3 + 2] spiroannulation pathway by overcoming undesired β-hydride elimination. Preliminary
在钯催化下,易于获得的苯酚衍生的联芳基与丙二烯反应,从而提供了多种高度有价值的螺环[环己烷-1,1'-茚] -2,5-二烯-4-酮。这一新的催化过程涉及苯酚的区域选择性烯丙基脱芳香化的关键步骤,通过克服了不希望的β-氢化物消除,有效地通过了[3 + 2]螺环化途径。初步的不对称研究表明,使用市售的PHOX配体可以实现高对映选择性。此外,该方法的潜在应用通过多次进一步的转换得到了例证。