Pyrimido pyran

The synthesis of areno[ ]pyrimido[5,4-< ]pyran-2,4(l,3/7)-dionylium ions 1209 can be accomplished via a novel photoinduced oxidative cyclization of the enone 1208 (Equation 464) <2005T4919>. 

ZaR AR, lS,%aR -Tetrahydro-7-hydroxy-2,2-dimethyl-4,7-methano-l, 3-dioxolo[4,5-c]oxepin-6(4//)-one, Q-10 Tetrahydro-3-hydroxy-5-hydroxymethyl-3-furancarboxylic acid, T-26 2,3,3a, 9a-Tetrahydro-3-hydroxy-6-imino-6/ -furo[2, 3 4,5]oxazolo[3,2-a]-pyrimidine-2-methanol, C-170 Tetrahydro-5-hydroxy-3-methylene-2-furanmethanol, D-629 7,8,9,10-Tetrahydro-8-hydroxy-3-methyl-6,9-epoxy-2ff,6ff-pyrimido[2,l-6]-[l,3]oxazocin-2-one, A-715 Tetrahydro-2-hydroxy-6-methylpyran, H-144 Tetrahydro-2-(hydroxymethyl)pyran, T- ... 

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