The first organocatalyzed asymmetric dearomative cycloaddition between 2-nitrobenzofurans and isatin-derived Morita–Baylis–Hillman carbonates has been developed. Using a modified cinchona alkaloid as the catalyst, a series of structurally diverse cyclopenta[b]benzofuran derivatives with three contiguous stereocenters, including a spiro-quaternary chiral center, could be smoothly obtained in excellent
已经开发了第一个在
2-硝基苯并呋喃和伊斯丁衍生的森田-贝利斯-希尔曼
碳酸盐之间进行有机催化的不对称脱芳香环加成反应。使用修饰的
金鸡纳
生物碱作为催化剂,可以顺利获得一系列结构多样的具有三个连续立体中心(包括螺-季手性中心)的环戊[ b ]
苯并呋喃衍
生物,且效果极佳(所有情况> 20:1 dr,up至99%的收率和98%的ee)。该方法的实用性通过产品的多功能转换得以展示。