By the action of 2‐aminothiazole, 2‐aminopyridines, and 2‐aminopyrimidines, respectively, on 4‐chloro‐3‐nitrocoumarin (3) the corresponding 4‐heteroarylamino‐3‐nitrocoumarins 5–7 have been isolated in very good yields. Reactions of coumarins 6 and 7 with either aqueous tetrabutylammonium bisulfate/sodium hydroxide in a two phase system or 5% aqueous sodium hydroxide have been studied.
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Govori et al. (1996) studied this question.
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