2H-Oxo-chromenyl acrylates and 2H-imino-chromenyl acrylonitriles have been prepared from a salicylaldehyde and ethyl cyanoacetate or 2-amino-1,1,3-tricyanopropene, respectively. The reaction occurs in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO) and the products were isolated in good to quantitative yields. Despite the simplicity of the synthesis, this is the first time that these substituted chromenes have been isolated.

中文翻译：

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一种方便的丙烯酸铬烯酯和丙烯腈的一锅法合成

2H-氧代-色烯基丙烯酸酯和2H-亚氨基-色烯基丙烯腈分别由水杨醛和氰基乙酸乙酯或2-氨基-1,1,3-三氰基丙烯制备。该反应在 1,4-二氮杂双环 [2.2.2] 辛烷 (DABCO) 的存在下发生，并且以良好的定量收率分离产物。尽管合成简单，但这是首次分离出这些取代的色烯。