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A novel synthesis of poly substituted chromenes from various salicylaldehydes and alkynes not having electron withdrawing substituents under mild conditions has been developed. The procedure is applicable for easily available various substituted salicylaldehydes and alkynylsilanes. The present reaction provides versatile access to functionalized 2H-chromenes that would be a useful tool for the synthesis...
5-(Phenylthio)pyrano[3,2-c][1]benzopyrans (6) were successfully synthesized in high yield by the reaction of 5-phenylthio-4-penten-1-ol (5) and salicylaldehyde (1) in benzene in the presence of p-toluenesulfonic acid and trimethyl orthoformate. trans,trans-Isomer 6a and cis,cis-isomer 6d were produced as major products from (E)-5 and (Z)-5, respectively. Treatment of 6a with lithium 4,4'-di-tert-butylbiphenyl...
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