Synthesis 2022; 54(16): 3613-3622
DOI: 10.1055/s-0040-1719924
paper

Recyclable Palladium-Catalyzed Carbonylative Coupling of 2-Iodoanilines, Trimethyl Orthoformate, and Amines: A Practical Synthesis of Quinazolin-4(3H)-ones

Jianying Li
a   School of Biology and Environmental Engineering, Jingdezhen University, Jingdezhen 333000, P. R. of China
,
Zebiao Zhou
b   College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. of China
,
Gang Xie
b   College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. of China
,
Mingzhong Cai
b   College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. of China
› Institutsangaben
We thank the National Natural Science Foundation of China (No. 21664008), the Natural Science Foundation of Jiangxi Province of China (No. 20161BAB203086), and Key Laboratory of Functional Small Organic Molecule, Ministry of Education (No. KLFS-KF-201704) for financial support.


Abstract

An efficient heterogeneous palladium-catalyzed carbonylative annulation of 2-iodoanilines, trimethyl orthoformate, and amines has been developed. The reaction proceeds smoothly in toluene at 110 °C using N,N-diisopropylethylamine (DiPEA) as base and 2 mol% of MCM-41-anchored bidentate phosphine palladium complex [MCM-41-2P-Pd(OAc)2] as catalyst under 10 bar of carbon monoxide and provides a general and practical method for the construction of a wide variety of quinazolin-4(3H)-ones in good to excellent yields from commercially easily available starting materials. This heterogenized palladium catalyst can be easily recovered via a simple centrifugation process and reused more than nine times with almost consistent catalytic efficiency.

Supporting Information



Publikationsverlauf

Eingereicht: 10. Februar 2022

Angenommen nach Revision: 11. April 2022

Artikel online veröffentlicht:
19. Mai 2022

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