Cu(ii)–PHOX-catalyzed malonate addition onto 3-hydroxy 3-indolyl-2-oxindoles afforded products in >99% ee. A Cu(ii)-species has been identified as an active species based on detailed X-ray, NMR, CV and EPR experiments.
Cu(II)-PHOX催化的马来酸盐加成反应生成了产物,其对映度高达99%以上。基于详细的X射线、核磁共振、循环伏安和电子顺磁共振实验,已确定Cu(II)物种作为活性物种。