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Thiophenes and benzothiophenes bearing alkyl or aryl substituents at the 2- or 3-positions are successfully carboxylated with CO2 with aid of EtAlCl2 to give the corresponding 2- or 3-carboxylic acids in up to 90% yield.

Me 2AlCl-Mediated Carboxylation, Ethoxycarbonylation, and Carbamoylation of Indoles. -(NEMOTO, K.; TANAKA, S.; KONNO, M.; ONOZAWA, S.; CHIBA, M.; TANAKA, Y.; SASAKI, Y.; OKUBO, R.; HATTORI*, T.; Tetrahedron 72 (2016) 5, 734-745, http://dx.doi.org/10.1016/j.tet.2015.12.028 ; Dep. Biomol. Eng., Grad. Sch. Eng., Tohoku Univ., Aoba, Sendai 980, Japan; Eng.) -M. Tismer 22-122

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