A new and efficient procedure for the synthesis of hexahydropyrimidine-fused 1,4-naphthoquinones
作者:Marcelo Isidoro P Reis、Vinícius R Campos、Jackson A L C Resende、Fernando C Silva、Vitor F Ferreira
DOI:10.3762/bjoc.11.137
日期:——
A new and efficient method for the synthesis of hexahydropyrimidine-fused 1,4-naphthoquinones in one step with high yields from the reaction of lawsone with 1,3,5-triazinanes was developed.
Inverse-electron-demand [4+2] cycloaddition of photogenerated aza-<i>ortho</i>-quinone methides with 1,3,5-triazinanes: access to perfluoroalkylated tetrahydroquinazolines
Base-induced inverse-electron-demand aza-Diels-Alder reaction of azoalkenes and 1,3,5-triazinanes: Facile approaches to tetrahydro-1,2,4-triazines
作者:Chaofan Wang、Ling Fang、Zhiyong Wang
DOI:10.1016/j.tetlet.2021.153303
日期:2021.8
The base-induced an inverse-electron-demand aza-Diels-Alder reaction of in situ formed 1,2-diaza-1,3-dienes with formaldimines is reported. This protocol features cycloaddition of two in situ generated reactive intermediates and provides a reliable and practical method for the synthesis of tetrahydro-1,2,4-triazine derivatives in synthetically useful yields.
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 +
Reaction of 1,3,5-Triazinanes with Phosphoryl Diazomethanes: Access to 5-Phosphoryl-1,2,3,4-tetrahydropyrimidines
作者:Wenlai Xie、Chengzhuo Wang、Jiaxi Xu
DOI:10.1021/acs.orglett.4c00881
日期:2024.4.26
s is achieved efficiently through the microwave-assisted reaction with phosphoryl diazomethanes. Both trialkyl and triaryl 1,3,5-triazinanes were converted by diazomethyldiarylphosphine oxides, dialkyl diazomethylphosphonates, and alkyl diazomethyl(aryl)phosphinates and functionalized simultaneously in good to excellent yields. The reaction is a sequence of 1,3,5-triazinane fragmentation, tandem nucleophilic