ortho-Quinone methides, arising from a formal [2+2] cycloaddition between arynes and DMF, were found to facilely undergo a [4+2] cycloaddition with ester enolates or ketenimine anions to produce diverse coumarins in a straightforward manner.
ortho-
奎宁美酸甲酯是通过
芳香烃与
DMF之间的形式[2+2]环加成反应生成的,发现它们能够轻松地与酯烯醇盐或酮
亚胺阴离子进行[4+2]环加成反应,从而以简单的方式生成多样化的
香豆素。