The perrhenate-catalyzed decomposition of α-azidocarboxylate esters 1 with phosgene or diphosgene provides a simple approach to 2-isocyanato-2alkenoate esters 2. The latter undergo the usual addition reactions at the isocyanate group. In addition, the ester with R = R1 = H undergoes radical polymerization and can be used as a dienophile in Diets–Alder reactions. R, R1, e.g., H, Me, Ph.
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Effenberger et al. (1989) studied this question.