6-Aryl- and 6,7-diaryl-1,3-dimethyl-1H-perimidin-2(3H)-ones: synthesis, conformational stability, crystal structure and optical properties

• Published in: Organic & biomolecular chemistry 2024-12
• Main Authors: Dyatlov, Andrey L, Filatova, Ekaterina A, Pozharskii, Alexander F, Marchenko, Sergey S, Demidov, Oleg P, Chernyshev, Anatoly V, Metelitsa, Anatoly V, Brig, Sergei S, Medvedev, Michael G, Bekmansurov, Danis R, Morozov, Pavel G, Gulevskaya, Anna V
• Format: Article
• Language: English
• ISSN: 1477-0539; 1477-0539
• DOI: 10.1039/d4ob01680g

6-Bromo- and 6,7-dibromo-1,3-dimethyl-1H-perimidin-2(3H)-ones were arylated with arylboronic acids under Suzuki-Miyaura reaction conditions to afford 6-aryl-, 6-bromo-7-aryl- and 6,7-diaryl-1,3-dimethyl-1H-perimidin-2(3H)-ones. A comparison of the X-ray structural parameters of peri-diaryl derivatives of 1,3-dimethyl-1H-perimidin-2(3H)-one, naphthalene and 1,8-bis(dimethylamino)naphthalene (proton sponge) was performed. Based on the data of dynamic 1H NMR spectroscopy and quantum-chemical calculations, barriers to syn/anti-isomerization of 6,7-diaryl-1,3-dimethyl-1H-perimidin-2(3H)-ones were estimated. The optical properties of 6-aryl- and 6,7-diaryl-1,3-dimethyl-1H-perimidin-2(3H)-ones as structural analogs of fluorophoric 6-aryl- and 6,7-diaryl-1,8-naphthalimides were studied.6-Bromo- and 6,7-dibromo-1,3-dimethyl-1H-perimidin-2(3H)-ones were arylated with arylboronic acids under Suzuki-Miyaura reaction conditions to afford 6-aryl-, 6-bromo-7-aryl- and 6,7-diaryl-1,3-dimethyl-1H-perimidin-2(3H)-ones. A comparison of the X-ray structural parameters of peri-diaryl derivatives of 1,3-dimethyl-1H-perimidin-2(3H)-one, naphthalene and 1,8-bis(dimethylamino)naphthalene (proton sponge) was performed. Based on the data of dynamic 1H NMR spectroscopy and quantum-chemical calculations, barriers to syn/anti-isomerization of 6,7-diaryl-1,3-dimethyl-1H-perimidin-2(3H)-ones were estimated. The optical properties of 6-aryl- and 6,7-diaryl-1,3-dimethyl-1H-perimidin-2(3H)-ones as structural analogs of fluorophoric 6-aryl- and 6,7-diaryl-1,8-naphthalimides were studied.