Rydfjord J, Roslin S, Roy T, Abbas A, Stevens MY, Odell LR. Acyl Amidines by Pd-Catalyzed Aminocarbonylation: One-Pot Cyclizations and
11C Labeling.
J Org Chem 2022;
88:5078-5089. [PMID:
36520948 PMCID:
PMC10127271 DOI:
10.1021/acs.joc.2c02115]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A protocol for the carbonylative synthesis of acyl amidines from aryl halides, amidines, and carbon monoxide catalyzed by Pd(0) is reported herein. Notably, carbon monoxide is generated ex situ from a solid CO source, and several productive palladium ligands were identified with complementary benefits and substrate scope. Furthermore, sequential one-pot, two-step protocols for the synthesis of 1,2,4-triazoles and 1,2,4-oxadiazoles via acyl amidine intermediates are reported. In addition, this approach was extended to isotopic labeling using [11C]carbon monoxide to allow, for the first time, synthesis of 11C-labeled acyl amidines as well as a 11C-labeled 1,2,4-oxadiazole.
Collapse