The reaction of silyl-formamidines and silyl-thioformimidates with acyl fluorides gives N-acyl imidate methylides which have been successfully trapped with several dipolarophiles to afford pyrrolidine derivatives in high yields.
T. Livinghouse and R. Smith, J. Chem. Soc., Chem. Commun., 1983, 210 DOI: 10.1039/C39830000210
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