Abstract
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.
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