Catalytic Asymmetric 1,3-Dipolar [3 + 6] Cycloaddition of Azomethine Ylides with 2-Acyl Cycloheptatrienes: Efficient Construction of Bridged Heterocycles Bearing Piperidine Moiety
作者:Qing-Hua Li、Liang Wei、Chun-Jiang Wang
DOI:10.1021/ja503309u
日期:2014.6.18
Conjugated cyclic trienes without nonbenzenoid aromatic characteristic were successfully employed as fine-tunable dipolarophiles in the Cu(I)-catalyzed asymmetric azomethine ylide-involved 1,3-dipolar [3 + 6] cycloaddition for the first time, affording a variety of bridged heterocycles bearing piperidine moiety in good yield with exclusive regioselectivity and excellent stereoselectivity. 2-Acyl group
首次成功地将不具有非苯类芳香特征的共轭环状三烯用作 Cu(I) 催化的不对称偶氮甲碱叶立德涉及的 1,3-偶极 [3 + 6] 环加成反应中的微调亲极试剂,提供了多种桥接杂环以良好的收率带有哌啶部分,具有独特的区域选择性和出色的立体选择性。2-酰基是决定环化优先通过[3+6]-途径的关键因素,而2-酯基通过[3+2]-途径调节环化。