Synthesis of thiophenedicarbonyldiazides and Di‐<i>t</i>‐butyl thiophendicarbamates

Abstract

Abstract Dicarbamates 1b and 1c , and dicarbonyldiazides 2b and 2c are obtained in good yields starting from thiophenedicarboxylic acids 3b and 3c , but the vicinal diacids 3a and 3d are not suitable for the synthesis of dicarbamates 1a and 1d and dicarbonyldiazides 2a and 2d; 1a is prepared by a stepway procedure previously described, and 1d by t ‐butoxycarbonylation of the recently known 3,4‐thiophenediamine.