Triplet phenacylimidazoliums-catalyzed photocycloaddition of 1, 4-dihydropyridines: An experimental and theoretical study

X Zhu, W Li, H Yan, R Zhong

Index: Zhu, Xiaohe; Li, Weipeng; Yan, Hong; Zhong, Rugang Journal of Photochemistry and Photobiology A: Chemistry, 2012 , vol. 241, p. 13 - 20

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Citation Number: 9

Abstract

The photocycloadditions of 1, 4-dihydropyridines (DHPs) were achieved by using phenacylimidazoliums (PIms) as photosensitizers. Irradiation of DHPs 3a–g in the presence of PIms 1a–e and 2 performed an efficient formation of 3, 9-diazatetraasteranes in shorter times under a lower power lamp. The mechanism of photocycloaddition catalyzed by PIm was studied by laser flash photolysis and theoretical DFT computation. These time- ...