Browsing by Author "Jenkins, PR"

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    Synthesis of 2H-naphtho[2,3-b]thiopyranoquinones and density functional study for the Diels-Alder reaction of a benzothiopyranoquinone
    (PERGAMON-ELSEVIER SCIENCE LTD, 2000) Tapia, RA; Garate, MC; Valderrama, JA; Zuloaga, F; Jenkins, PR; Fawcett, J; Russell, DR
    The synthesis of benzothiopyranoquinone (6) in three step from benzothiopyran (3) is described. Diels-Alder reaction of quinone (6) with 1,3-pentadiene (7), cyclopentadiene, 1-methoxy-1,3-cyclohexadiene (11) and 1-dimethylamino-1-aza-1,3-pentadiene (14) was studied. The Density Functional Theory was applied to explain the orientation of the cycloaddition reaction of quinone (6) with dienes (7), (11) and (14).
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    Synthesis of furanonaphthazarin derivatives
    (PERGAMON-ELSEVIER SCIENCE LTD, 1998) Tapia, RA; Garate, MC; Valderrama, JA; Jenkins, PR
    A three-step synthesis of the 58-dihydroxy-2-(1-methylethyl)naphtho[2,3-b]furan-4,9-dione (9) starting from 2-hydroxy-5,8-dimethoxy-1,4-naphthoquinone (4), is described. Further treatment of (9) with selenium dioxide in the presence of pyridine N-oxide as co-oxidant gave 2-(1-hydroxy-1-methylethyl)naphtho[2,3-b]furan-4,9-dione (10).