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New syntheses of haginin E, equol, daidzein, and formononetin are described in this Letter. Through a sequence of a Wittig reaction, O-alkylation, and another Wittig reaction, 4-benzyloxysalicylaldehyde, which was prepared from resorcinol in two steps, was converted into the desired diene in one pot. Subsequently, the prepared diene was subjected to ring-closing metathesis using Grubbs’ catalyst (II)...
The present paper described how to establish a novel approach for various alkoxycyanonaphthalenes. It was started from isovanillin, and based on the Claisen rearrangement, O-alkylation, the Baylis–Hillman reaction, and ring-closing metathesis in sequence to produce the title compounds in good yield.
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