Synthesis and chemical transformations of 2-aminochromone derivatives

Glozman, Sh. M.; Zhmurenko, L. A.; Zagorevskii, V. A.

doi:10.1007/bf00771403

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“…4-Chlorocoumarin 2 has been synthesised (i) by heating chromone-2-carboxylic acid with SOCl 2 or PCl 5 for 20 to 30 h or with PCl 5 in POCl 3 solution; 13 (ii) by treatment of POCl 3 on ethyl N-(2-chromonyl)carbamate, 14 or 4-hydroxycoumarin 15 (for the latter, formation of a tercoumarin is a wasteful side reaction); (iii) by treatment of Ph 3 P and CCl 4 on 4-hydroxycoumarin. 16 An efficient method for the synthesis of 2-aminochromones 1 and 2,2'-diaminobischromones 8 has been reported from our laboratory.…”

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confidence: 99%