Browsing by Author "TAPIA, R"
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- ItemNEW SYNTHESIS OF URACIL AND 2-THIOURACIL(1984) CASSIS, R; TAPIA, R; VALDERRAMA, JA
- ItemNITRIC-ACID ON SILICA-GEL - A USEFUL NITRATING REAGENT FOR ACTIVATED AROMATIC-COMPOUNDS(1986) TAPIA, R; TORRES, G; VALDERRAMA, JA
- ItemSTUDIES ON QUINONES .21. REGIOSELECTIVE SYNTHESIS OF TETRACYCLIC QUINONES RELATED TO RABELOMYCIN(1991) VALDERRAMA, JA; ARAYA-MATURANA, R; GONZALEZ, MF; TAPIA, R; FARINA, F; PAREDES, MCThe Diels-Alder reaction of the hydroxyquinones 5, 11 and 16 with (E)-1-trimethylsiloxybuta-1,3-diene 3 afforded the corresponding mixture of the regioisomers 6a,b, 12a,b and 17a,b in the ratios 9:1, 8:1 and 11:1, respectively. From these mixtures, the quinones 8, 14 and 19 were obtained by hydrolysis and subsequent oxidation.