The highly reactive 1:1 intermediate produced in the reaction between tert-butyl isocyanide and dialkyl acetylenedicarboxylates is trapped by dialkyl 2-bromomalonates to yield the title compounds in fairly high yields.
I. Yavari, A. Ali Esmaili, S. Asghari and H. Reza Bijanzadeh, J. Chem. Res. (S), 1999, 368 DOI: 10.1039/A808983C
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