Asymmetric Synthesis of cis-4-Aminobenzopyran Derivatives Catalyzed by N,N′-Dioxide-Sc(OTf)3 Complexes
作者:Yulong Zhang、Shunxi Dong、Xiaohua Liu、Mingsheng Xie、Yin Zhu、Lili Lin、Xiaoming Feng
DOI:10.1002/chem.201102058
日期:2011.12.2
The reactions of salicylaldimines with electron‐rich alkenes (2,3‐dihydro‐2H‐furan and 3,4‐dihydro‐2H‐pyran) catalyzed by N,N′‐dioxide–Sc(OTf)3 complexes were investigated. The methodology was successfully applied to the asymmetric synthesis of cis‐4‐aminobenzopyran derivatives. Excellent yields, diastereo‐ and enantioselectivities were observed for a broad range of substrates under mild conditions
研究了水杨醛亚胺与富含电子的烯烃(2,3-二氢-2 H-呋喃和3,4-二氢-2 H-吡喃)在N,N'-二氧化物-Sc(OTf)3配合物催化下的反应。该方法已成功地用于不对称合成顺-4-氨基苯并吡喃衍生物。在温和条件下,对多种底物均观察到优异的收率,非对映和对映选择性(参见方案)。