Preparation of spiro[imidazolidine-4,3′-indolin]-2′-imines via copper(i)-catalyzed formal [2 + 2 + 1] cycloaddition of 3-diazoindolin-2-imines and triazines
Enantioselective Mannich Reaction Employing 1,3,5-Triaryl-1,3,5-triazinanes Catalyzed by Chiral-at-Metal Rhodium Complexes
作者:Jun Gong、Shi-Wu Li、Saira Qurban、Qiang Kang
DOI:10.1002/ejoc.201700463
日期:2017.7.7
Chiral-at-metal Rh(III) complexes catalyzed highly efficient enantioselectiveMannichreaction of 2-acyl imidazoles with 1,3,5-triazinanes is developed, affording the corresponding adducts in 81-99% yields with up to >99% enantioselectivities. This protocol performs with 0.1 mol % of Rh(III) complex on gram scale without loss in enantioselectivity.
A Three‐Component Reaction to Construct β‐Aminonitroso‐α‐Diazocarbonyl Compounds under Metal‐Free Conditions
作者:Rongxiang Chen、Jihong Lan、Feng Li、Kai‐Kai Wang、Yinghui Xue、Canran Xu、Lantao Liu
DOI:10.1002/adsc.202200025
日期:2022.4.12
A procedure for the transition-metal-free three-component reaction of 1,3,5-triazines, diazo compounds and tert-butyl nitrite has been described. This reaction goes through tandem nucleophilic attack to generate synthetically important β-aminonitroso-α-diazocarbonyl compounds in moderate to good yields. This protocol is distinguished by the use of readily available starting materials, wide substrate
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
Zn(OTf)2-catalyzed peroxidation of 1,3,5-triazines has been developed, accessing diversely substituted α-amino tertiary alkylperoxides with high efficiency under mild conditions. Moreover, the three-component reaction of amine, hydroperoxide, and paraformaldehyde was also proved to give the desired product. Mechanistic investigations and useful synthetic application of the products have also been presented
Inverse‐Electron‐Demand [4+2]‐Cycloaddition of 1,3,5‐triazinanes: Facile Approaches to Tetrahydroquinazolines
作者:Yongsheng Zheng、Liang Tu、Na Li、Rong Huang、Tao Feng、Huan Sun、Zhenghui Li、Jikai Liu
DOI:10.1002/adsc.201801063
日期:2019.1.11
unprecedented inverse‐electron‐demand [4+2] cycloaddition reaction of in situ generated aza‐o‐quinone methides with 1,3,5‐triazinanes has been developed under mild conditions, providing an efficient and mild approach to synthesize tetrahydroquinazolines in high yields (up to 99%) with excellent functional group tolerance. This protocol represents the first example of inverse‐electron‐demand [4+2] cycloaddition