Unusual regio- and stereo-selectivity in Diels–Alder reactions between bulky N-phenylmaleimides and anthracene derivatives
作者:Hao Chen、Erdong Yao、Chi Xu、Xiao Meng、Yuguo Ma
DOI:10.1039/c4ob01052c
日期:——
Unusual regio- and stereo-selectivity in Diels–Alder (D–A) reactions were achieved between bulky N-phenylmaleimides and anthracene derivatives. Using multiple substituents with steric hindrance on both diene and dienophile, a noticeable shift toward 1,4-addition was successfully obtained. The substrate scope in this reaction was broad and the highest yield of anti-1,4-adducts was over 90%. Novel structures
Diels–Alder(D–A)反应中异常的区域选择性和立体选择性在庞大的N-苯基马来酰亚胺和蒽衍生物之间实现。使用在二烯和亲二烯体上都具有位阻的多个取代基,成功地获得了明显的向1,4-加成的转变。该反应中的底物范围广,抗-1,4-加合物的最高收率超过90%。通过单晶X射线衍射分析证实了抗-1,4-加合物的新颖结构。这项研究不仅提供了第一个报道的合成抗-1,4-加合物并获得了其他方式无法实现的区域和立体选择性,但同时也阐明了将两种反应物的空间效应相结合以使产物向1,4-加合物转化的重要性。此外,所得的1,4-加合物可以通过碳-碳偶合反应通过其卤素基团进一步官能化。