Provided are macrocyclic compounds having a macrocyclic core which has at least one macrocyclic donor and at least one pendant group which has at least one donor group. The macrocyclic compounds can be complexed to Fe(II) and Ni(II). The macrocyclic compounds can be used in imaging methods. For example, the compounds can be used MRI paraCEST contrast agents.
Retro-ene reactions in heterocyclic synthesis. v. a novel synthetic method for 1,3,5-triazine-2,4(1H,3H)-diones
作者:The Late Kunio Ito、Chiharu Sekiguchi、Asuka Wakai Hiroyuki Miida、Shogo Ihara
DOI:10.1002/jhet.5570440648
日期:2007.11
N-t-Butylamidines 1 on heating with diphenyl carbonate (2) at 150-180° gave the 1,3,5-triazine-2,4(1H,3H)-dione derivatives 5. Acylation of amidines 1 and cyclocondensation of the resulting carbamates 3 gave [1,3,5,7]tetrazocine-2,6-dione derivatives 4, and subsequent retro-enereaction and ring contraction afforded triazine derivatives 5.