K. Ohkura, Y. Noguchi, K. Seki
1997
Citations
0
Influential Citations
7
Citations
Journal
Chemistry Letters
Abstract
Contrasting to the photoreaction of 6-chloro-1,3-dimethyluracil in benzene at ambient temperature in the presence of trifluoroacetic acid, whereby 1,3-dimethylcyclooctapyrimidine was produced as a sole cycloadduct, the similar photoreaction in frozen benzene at −15 ∼ −20 °C proceeded quite differently to give three novel photocycloadducts, 7-chloro-1,3-dimethyl-4b,5,7a,8-tetrahydropentaleno[1,2-e]pyrimidine-2,4-dione, 5-chloro-1,3-dimethyl-4b,7,7a,8-tetrahydropentaleno[1,2-e]pyrimidine-2,4-dione, and 6-chloro-10,12-diazapentacyclo[6.4.0.01,3.02,5.04,8]dodecane-9,11-dione.