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A convenient approach for the preparation of (1S,3′R,4′S,5′S,6′R)-5-chloro-6-[(4-ethylphenyl)methyl]-3′,4′,5′,6′-tetrahydro-6′-(hydroxymethyl)-spiro[isobenzofuran-1(3H), 2′-[2H]pyran]-3′,4′,5′-triol is developed. The targeted compound was synthesized from 2-bromo-4-methylbenzoic acid in nine steps and the isomers of undesired ortho-products were avoided during the preparation.
A new compound, 6-methylsulfinylthieno [3,2-g]-2,4(1H,3H)-pteridinedione, was isolated from the water extract of Whitmania pigra Whitman. Its structure was elucidated on the basis of NMR and ESIMS spectra.
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