Gabbutt, Christopher D., Hepworth, John D. and Heron, B. Mark (1992) Synthesis of the 5-thiorotenoid system from thiochroman-3-one. Journal of the Chemical Society, Perkin Transactions 1 (22). pp. 3015-3018. ISSN 0300-922X

Base-induced cyclisation of the diketones 10(X = H or F), prepared in a two-step sequence from thiochroman-3-one, affords 6H,12H-[1]benzothiopyrano[3,4-b][1]benzopyran-12-ones 11. Reduction with diisobutylaluminium hydride affords a separable mixture of the cis- and trans-5-thiorotenoids. Dieckmann cyclisation of ethyl 2-(ethoxycarbonylmethylthio)phenylethanoate affords a mixture of 4-ethoxycarbonyl- and 2-ethoxycarbonyl-thiochroman-3-ones. Attempts to prepare a thiorotenoid by condensation of these β-keto esters with 4-methoxyphenol resulted in formation of the novel bis[1]benzothiopyrano[3,2-b:4′,3′-e]pyran ring system.

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