A one-pot synthesis of functionalised 1-azadienes containing 2-thioxoimidazolidin-4-ones

摘要

The zwitterionic 1:1 intermediates generated by addition of alkyl isocyanides to acetylenic esters are trapped by 3-methyl-5,5-diaryl-2-thioxoimidazolidin-4-ones to yield dialkyl 2-[(alkylimino)(3-methyl-4-oxo-5,5-diaryl-2-thioxoimidazolidin-1-yl)methyl]but-2-enedioates in good yields.