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2005
Thiopyran derivatives
R 0370
One-Pot Synthesis of 12-Hydroxy-12H-benzo[b]thioxanthene-6,11-diones from
and o-Acylbenzenethiols. — A sequential conjugate addition
12- 143 1,4-Naphthoquinone
and aldol-type reaction between naphthoquinone (II) and acylbenzenethiols (I) and (IV)
takes place without any catalyst or initiator to give the desired products (III) and (V).
In the case of the reaction between (II) and (IV) slightly modified conditions are
necessary to initiate the reaction or to avoid intractable mixtures of products. This can
be achieved by using equimolar amounts of the reactants and by exposition of the
cooled reaction mixtures to air. — (KOBAYASHI*, K.; UMAKOSHI, H.;
MATSUNAGA, A.; TANMATSU, M.; MORIKAWA, O.; KONISHI, H.; Bull. Chem.
Soc. Jpn. 77 (2004) 11, 2095-2096; Dep. Mater. Sci., Fac. Eng., Tottori Univ.,
Koyama, Tottori 680, Japan; Eng.) — H. Hoennerscheid
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