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Synlett 2024; 35(04): 464-468
DOI: 10.1055/a-2106-5108
DOI: 10.1055/a-2106-5108
cluster
11th Singapore International Chemistry Conference (SICC-11)
Synthesis of Carbamoyl Azides from Redox-Active Esters and TMSN3
This work was supported by the National Natural Science Foundation of China (NSFC; Grant No. 22001251, 21871258, 21922112, and 22225107), the National Key Research and Development Program of China (Grant No. 2017YFA0700103), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB20000000).
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Abstract
An efficient method for construction of C–N bonds is reported here. The iron-catalyzed azidation of N-hydroxy phthalimide (NHP) esters provides a convenient approach for the synthesis of carbamoyl azides with good substrate scope and functional group tolerance. Both aryl carbon C(sp2) and alkyl carbon C(sp3) sources can be used deliver the carbamoyl azides. Mechanistic studies were conducted and a two-stage process was identified.
Supporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2106-5108.
- Supporting Information
Publication History
Received: 24 February 2023
Accepted after revision: 06 June 2023
Accepted Manuscript online:
06 June 2023
Article published online:
21 July 2023
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- 15 Typical Procedure: A flame-dried reaction tube with a magnetic stirring bar was charged with NHP ester 1a (0.5 mmol, 133 mg), ferric acetate (10 mol%, 9.5 mg) and THF (5.0 mL) under a nitrogen atmosphere. TMSN3 (1.5 mmol, 0.2 mL) was then injected into the tube and the mixture was heated at 70 °C (oil bath) for 24 h. After reaction completion as detected by TLC, the solid was removed by filtration and the filtrate was concentrated. The residue was purified by column chromatography (silica gel, PE/EtOAc = 10:1) to afford the carbamoyl azide 2a (73.7 mg, 91% yield) as a white solid; mp 105–106 °C. 1H NMR (600 MHz, CDCl3): δ = 7.42 (d, J = 8.1 Hz, 2 H), 7.35–7.31 (m, 2 H), 7.12 (t, J = 7.4 Hz, 1 H), 6.83 (br, 1 H). 13C NMR (151 MHz, CDCl3): δ = 154.00, 136.95, 129.31, 124.75, 119.27.