54487-71-7Relevant articles and documents
Direct C-2 Carboxylation of 3-Substituted Indoles Using a Combined Br?nsted Base Consisting of LiO-tBu/CsF/18-crown-6
Shigeno, Masanori,Tohara, Itsuki,Nozawa-Kumada, Kanako,Kondo, Yoshinori
, p. 1987 - 1991 (2020)
Herein, we report that a combination of LiO-tBu, CsF, and 18-crown-6 can be used to carry out the carboxylation of indole derivatives at the C-2 position under an ambient CO2 atmosphere. Substrates bearing an electrophilic substituent (i.e., cyano, formyl, benzoyl, phenylsulfonyl, phenylsulfinyl, and chloride) at the C-3 position are smoothly converted into their corresponding carboxylated products with high functional group compatibility.