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)methyllbut-2-enedioates in good yields.
机构:
Univ Naples Federico II, Dipartimento Chim Organ & Biol, I-80134 Naples, ItalyUniv Naples Federico II, Dipartimento Chim Organ & Biol, I-80134 Naples, Italy