Synthesis, characterisation and reactivity studies of chiral β-diketiminate-like supported aluminium Lewis acid complexes towards difficult Diels Alder cycloadditions
作者:Deepamali Dissanayake、Craig Forsyth、Dragoslav Vidović
DOI:10.1039/d3dt00206c
日期:——
Synthesis and characterisation of several chiral, oxazoline containing β-diketiminate type ligand supported-aluminium compounds are reported. Together with 1 equiv. of Na(BArCl4) (ArCl = 3,5-Cl2-C6H3), these chiral Lewis acid complexes, which possess an “achiral end” and “chiral end” have been successfully utilised as catalysts in asymmetric Diels–Alder reactions of 1,3-cyclohexadiene and several different
报道了几种手性恶唑啉含 β-二酮亚胺基配体负载型铝化合物的合成和表征。连同 1 当量。Na(BAr Cl 4 ) (Ar Cl = 3,5-Cl 2 -C 6 H 3 ),这些具有“非手性末端”和“手性末端”的手性路易斯酸配合物已成功用作不对称催化剂1,3-环己二烯和几种不同的查尔酮的 Diels-Alder 反应。配体“非手性末端”空间需求的系统增加” 这些配合物导致 1,3-环己二烯和查尔酮环化的对映体诱导增强。“手性末端”的进一步结构修饰清楚地表明,叔丁基连接到恶唑啉片段的手性中心产生了所检查的环化的最高对映选择性值。然后使用几种不同的亲二烯体(即查尔酮)扩大底物范围,产生 24-68% 的对映体过量范围。