Abstract The tert‐butyl esters of indole‐5‐carboxylic acid and relatedcompounds such as benzofuran‐ and benzothiophene‐5‐carboxylic acid were readily accessed by reacting the appropriate carboxylic acids with tert‐butyl trichloroacetimidate. To obtain the tert‐butyl esters of the 5‐carboxylic acids of 1H‐benzotriazole and 1H‐benzimidazole, position 1 of these heterocycles had to be protected by acetylation
Cross-Electrophile Silylation of Aryl Carboxylic Esters with Hydrochlorosilanes by SiH-Directed and Cr-Catalyzed Couplings
作者:Chao Li、Shangru Yang、Xiaoming Zeng
DOI:10.1021/acscatal.3c02852
日期:2023.9.15
coupling of two strong electrophilic bonds has been less developed. We report here silylationreactions that proceed by coupling of strong Si–Cl/C–O bonds in a process that is promoted by chromium catalysis via α-agostic SiH → Cr interactions, allowing the formation of Si–C bonds under ambient conditions. The reactions occur by coupling of inexpensive hydrochlorosilanes with unactivated aryl carboxylic