Pindur U, Rogge M. New [4 + 2] Cycloadditions of in situ Generated Indolyl Enol Ethers and Their Anions with Dimethyl Acetylenedicarboxylate: A One-Pot Access to 4-Alkoxy-Substituted Carbazoles. Chimia [Internet]. 1992 Nov. 25 [cited 2024 Nov. 26];46(11):441. Available from: https://www.chimia.ch/chimia/article/view/1992_441