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Synlett 2020; 31(07): 677-682
DOI: 10.1055/s-0039-1691579
DOI: 10.1055/s-0039-1691579
letter
Visible-Light-Triggered Decarboxylative Alkylation of 8-Acylaminoquinoline with N-Hydroxyphthalimide Ester
Authors
We thank the National Natural Science Foundation of China (Grant No. 21606202) for financial support. We are also grateful to the College of Pharmaceutical Sciences, Zhejiang University of Technology and Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals for the financial help.
Further Information
Publication History
Received: 25 December 2019
Accepted after revision: 04 January 2020
Publication Date:
28 January 2020 (online)
Abstract
A facile protocol for visible-light-induced decarboxylative radical coupling of NHP esters with 8-aminoquinoline amides is reported, affording a highly efficient approach to synthesize a variety of 2-alkylated or 2,4-dialkylated 8-aminoquinoline derivatives. The reaction proceeds smoothly without adding any ligand, and provides the corresponding products containing a wide range of functional groups in moderate to excellent yields. This reaction uses readily available starting materials, and proceeds under mild conditions and with operational simplicity.
Supporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0039-1691579.
- Supporting Information (PDF) (opens in new window)
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- 16 Synthesis of 3; Typical Procedure for 3aa: A 10 mL Schlenk-tube was charged with N-(quinolin-8-yl)benzamide (1a; 124 mg, 0.5 mmol), tert-butyl NHP ester 2a (247 mg, 1.0 mmol), fac-Ir(ppy)3 (6 mg, 0.015 mmol), trifluoroacetic acid (29 mg, 0.25 mmol) and DMSO (3.0 mL). The tube was evacuated and backfilled with N2 for three times. The mixture was then irradiated with 3 W white CFL lamps and stirred for 12 hours at room temperature. After the reaction finished, the reaction was quenched with water (10 mL) and the mixture was extracted with DCM (10 mL). The organic layer was dried over Na2SO4 and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica gel column (ethyl acetate/hexane, 1:200) to afford 3aa (123 mg, 81%) as a white solid; mp 131.0–132.0 °C. 1H NMR (400 MHz, CDCl3): δ = 11.04 (s, 1 H), 8.92 (d, J = 7.1 Hz, 1 H), 8.20–8.11 (m, 3 H), 7.68–7.48 (m, 6 H), 1.55 (s, 9 H). 13C NMR (101 MHz, CDCl3): δ = 167.6, 156.3, 148.6, 144.4, 137.1, 136.5, 134.0, 126.6, 126.0, 121.3, 119.0, 116.3, 114.8, 112.4, 38.3, 30.1. HRMS: m/z [M + H]+ calcd for C20H21N2O: 305.1648; found: 305.1638.