Malononitrile → 2-[(4-Hydroxy-3-iodo-5-methoxyphenyl)methylene]malononitrile

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Reaction Steps

A preferred method of synthesis of (E)-1-cyano-3-(3-iodo-4,5-hydroxyphenyl)acrylonitrile (Compound 2) is as follows: The compound was prepared as described in Ohmichi et al., 1993, Biochemistry 32: 4650 in two steps. First, 3-methoxy-4-hydroxy-5-iodobenzylidene malononitrile was prepared by adding 3 drops of piperidine to 1.4 g of 5-iodovanillin and 0.4 g of malononitrile in 25 ml of ethanol and refluxing the mixture for 4 hours. 0.8 g (49% yield) of a yellow solid resulted.

Provenance & Evidence