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The synthesis of 2 H -chromenes based on a fluorenone nucleus is described. Whereas 2,2-diphenyl-2 H -pyranofluorenones 4 – 7 and dicyanomethylidene-2 H -pyranofluorenes 8 – 10 do not exhibit photochromism, 2,2-diphenyl-2 H -pyranofluorenols exhibit photochromic behaviour. The spectrokinetic...
2-Aryl-substituted-1-isopropyl- and 1-phenylhexahydropyrimidines and 3-isopropyl- and 3-phenyl-1,2,3,4-tetrahydroquinazolines proved to be ring-chain tautomeric mixtures in CDCl 3 at 300 K, whereas only ring-closed tautomers could be detected for the 1- or 3-methyl-substituted analogues. The...
Ozonolyses of 1-alkyl-substituted 1- tert -butylethylenes and of highly methylated methylenecycloalkanes were conducted in the presence of trifluoroacetophenone ( 7 ) in ether. The ozonolysis of 2,2,6-trimethyl-1-methylenecyclohexane provided only the crossed-ozonide 10 derived from capture of...
(+)-Euryfuran adds regiospecifically to activated monosubstituted 1,4-benzoquinones under mild conditions to give the corresponding Michael adducts which, depending on the quinone substituent, undergo in situ redox reactions to the respective euryfurylbenzoquinones. One of these Michael adducts...
Replacement of the negatively charged phosphodiester linkages of RNA with positively charged guanidinium linkages provides the polycationic ribonucleic guanidine (RNG). RNG is designed to bind strongly to target DNA/RNA through the specific interactions of nucleobases and the attractive...
Three of the four steps in the slow spontaneous autoxidation of dihydroartemisinic acid to artemisinin (‘ene-type’ reaction of molecular oxygen with the Δ 4,5 double bond, Hock cleavage of the resulting tertiary allylic hydroperoxide, oxygenation of the enol product from Hock cleavage and...
4-Hydroxy coumarin and its benzo-analogues undergo intramolecular domino Knoevenagel hetero Diels–Alder reactions with O-prenylated aromatic aldehydes and the aliphatic aldehyde, citronellal to afford pyrano fused polycyclic frameworks. A high degree of chemoselectivity was achieved by the...
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