Cycloreversion of β-lactams via photoinduced electron transfer
作者:Raúl Pérez-Ruiz、Jose A. Sáez、M. Consuelo Jiménez、Miguel A. Miranda
DOI:10.1039/c4ob01416b
日期:——
With DABCO as an electron donor, photoinduced cycloreversion of β-lactams leads to olefins through 1,4-radical anions and 1,4-biradicals as intermediates.
Ring splitting of azetidin-2-ones via radical anions
作者:Raúl Pérez-Ruiz、Jose A. Sáez、Luis R. Domingo、M. Consuelo Jiménez、Miguel A. Miranda
DOI:10.1039/c2ob26528a
日期:——
The radicalanions of azetidin-2-ones, generated by UV-irradiation in the presence of triethylamine, undergo ring-splitting via N–C4 or C3–C4 bond breaking, leading to open-chain amides. This reactivity diverges from that found for the neutral excited states, which is characterised by α-cleavage. The preference for β-cleavage is supported by DFT theoretical calculations on the energy barriers associated
Addition of Organostannanes to Isocyanate Catalyzed by a Rhodium Complex
作者:Tooru Koike、Masabumi Takahashi、Nobumichi Arai、Atsunori Mori
DOI:10.1246/cl.2004.1364
日期:2004.10
Arylstannanes add to isocyanate in the presence of a rhodium catalyst to afford amides in good to excellent yields. Use of a phenol derivative as an additive is found to play an essential role for the successful reaction.