Access to Imidazolidines via 1,3-Dipolar Cycloadditions of 1,3,5-Triazinanes with Aziridines
作者:Liang Tu、Zhenghui Li、Tao Feng、Shuyan Yu、Rong Huang、Jing Li、Wenxuan Wang、Yongsheng Zheng、Jikai Liu
DOI:10.1021/acs.joc.9b01959
日期:2019.9.6
The unprecedented 1,3-dipolar cycloaddition of 1,3,5-triazinanes and aziridines has been described. With readily available starting material, this method offers efficient access to a wide range of functionalized imidazolidine derivatives in moderate to good yields (up to 92%) under mild conditions. Preliminary mechanistic investigations show that the ring opened zwitterionic pathway product dominated
Access to Chiral Tetrahydroquinazolines/1,3-Benzoxazines via Iridium-Catalyzed Asymmetric [4 + 2] Cycloaddition
作者:Shengbiao Tang、Zhangru Cheng、Peng Zhang、Ying Shao、Jiangtao Sun
DOI:10.1021/acs.orglett.3c01004
日期:2023.5.26
An iridium-catalyzed asymmetric [4 + 2] cycloaddition of 1,3,5-triazinanes with 2-(1-hydroxyallyl)anilines/2-(1-hydroxyallyl)phenols has been developed, providing a straightforward and efficient approach to a wide range of tetrahydroquinazolines in good yields and excellent enantioselectivities (up to >99% ee). Typically, chiral 1,3-benzoxazines, which are challenging substrates in asymmetric [4 +