Synthesis of triphenylpyridines via an oxidative cyclization reaction using Sr-doped LaCoO 3 perovskite as a recyclable heterogeneous catalyst

• Published in: RSC advances Vol. 9; no. 41; pp. 23876 - 23887
• Main Authors: Le, Thu N M, Doan, Son H, Pham, Phuc H, Trinh, Khang H, Huynh, Tien V, Tran, Tien T T, Le, Minh-Vien, Nguyen, Tung T, Phan, Nam T S
• Format: Journal Article
• Language: English
• Published: England 01-08-2019
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C9RA04096J

An La
Sr
CoO
strontium-doped lanthanum cobaltite perovskite was prepared
a gelation and calcination approach and used as a heterogeneous catalyst for the synthesis of triphenylpyridines
the cyclization reaction between ketoximes and phenylacetic acids. The transformation proceeded
the oxidative functionalization of the sp
C-H bond in phenylacetic acid. The La
Sr
CoO
catalyst demonstrated a superior performance to that of the pristine LaCoCO
as well as a series of homogeneous and heterogeneous catalysts. Furthermore, the La
Sr
CoO
catalyst was facilely recovered and reused without considerable decline in its catalytic efficiency. To the best of our knowledge, the combination of ketoximes with easily available phenylacetic acids is novel.