Type II Photoreaction of 2-Benzoylcycloalkanones: Conformational Control in the Biradical Formation and in the Behavior of Biradicals
作者:Tadashi Hasegawa、Fusao Hojo、Michikazu Yoshioka
DOI:10.1246/bcsj.63.2428
日期:1990.8
The photoreactivities of 2-benzoylcycloalkanones were shown to be controlled by their ring conformation; 2-benzoylcycloalkanones underwent the TypeII elimination and/or cyclization, and/or the α-cleavage reaction.
Enantioselective synthesis of seven-membered carbo- and heterocyles by organocatalyzed intramolecular Michael addition
作者:James O. Guevara-Pulido、José M. Andrés、Deisy P. Ávila、Rafael Pedrosa
DOI:10.1039/c6ra04198a
日期:——
Unprecedented diastereo- and enantioselective synthesis of seven-membered rings has been achieved by organocatalyzed intramolecularMichaeladdition of enals bearing β-diketone functionality. The cyclization leads to 2,3-disubstituted cycloheptanone derivatives in high yield and excellent stereoselectivity. The same organocatalyzed cyclization process has been used to prepare six-membered homologs