作者:Ramadan A Bawa、Simon Jones
DOI:10.1016/j.tet.2004.01.070
日期:2004.3
The synthesis of 9-(4-benzyloxazolin-2-yl)anthracene is described employing a new approach for the cyclisation of β-hydroxy amides to oxazolines. Thermal Diels–Alder reactions with N-methyl maleimide were found to be considerably slower than those previously observed. Essentially no diastereoselectivity was observed in these reactions as the benzyl stereodirecting group is remote from the reactive
描述了使用新方法将9-(4-苄基恶唑啉-2-基)蒽合成的方法,该方法用于将β-羟基酰胺环化为恶唑啉。发现与N-甲基马来酰亚胺的热Diels–Alder反应比以前观察到的要慢得多。在这些反应中基本上没有观察到非对映选择性,因为苄基立体定向基团远离反应位点。在存在一些添加的路易斯酸的情况下,较小的速率增强是明显的,但没有非对映选择性。