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Synlett 2018; 29(01): 85-88
DOI: 10.1055/s-0036-1589099
DOI: 10.1055/s-0036-1589099
letter
Symmetrical Trichlorotriazine Derivatives as Efficient Reagents for One-Pot Synthesis of 3-Acetyl-2-chloroquinolines from Acetanilides under Vilsmeier–Haack Conditions
Weitere Informationen
Publikationsverlauf
Received: 11. Juni 2017
Accepted after revision: 28. August 2017
Publikationsdatum:
28. August 2017 (online)
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Abstract
Symmetrical trichlorotriazine derivatives such as 2,4,6-trichloro-1,3,5-triazine and trichloroisocyanuric acid were explored as Vilsmeier–Haack type reagents in the presence of N,N-dimethylacetamide for the effective synthesis of 3-acetyl-2-chloroquinolines from acetanilides. Ultrasonication led to shorter reaction times than conventional heating and gave yields comparable to those obtained under reflux conditions.
Key words
trichlorotriazines - Vilsmeier–Haack reaction - acetanilides - chloroacetylquinolines - sonicationSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0036-1589099.
- Supporting Information
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- 31 TCTA/DMA and TCCA/DMA ReagentsTCTA or TCCA (0.110 mol) and DMA (0.13 mol) were added to CH2Cl2 (50 mL) in a round-bottomed flask and the mixture was stirred for about 3 h at r.t. to give a white precipitate.
- 32 Cyclization/Acetylation of Acetanilides by Using TCTA/DMA or TCCA/DMA; General ProcedureThe appropriate acetanilide (9.8 mmol) was added to the TCTA/DMA or TCCA/DMA reagent, prepared as above, and the mixture was stirred constantly under reflux. When the reaction was complete (TLC), H2O (50.0 mL) was added, and the mixture was stirred to extract the inorganic components into the H2O and the crude product into the organic layer. The crude product was purified by column chromatography [Merck Silica Gel 60 (230–400 mesh), EtOAc–hexane].
- 33 Cyclization/Acetylation of Acetanilides by Using TCTA/DMA or TCCA/DMA with Sonication; General ProcedureThe method for the ultrasonically assisted reactions was similar to the classical method. The flask containing the reaction mixture, prepared as detailed above, was placed in a sonicator (KQ-250B; Kunshan Ultrasonic Instruments, Kunshan) at r.t., and the progress of the reaction was monitored by TLC. The product was separated and worked up by similar procedure to that described above.3-Acetyl-2-chloroquinoline (Tables 1 and 2, entry 1) solid; yield: (85%); mp 74–76 °C (Lit. 75–76 °C); IR (KBr): 1705 (C=O) cm–1. 1H NMR (CDCl3): δ = 2.70 (s, 3 H, COCH3), 7.0–8.25 (m, 5 H, arom). MS ESI: m/z = 205 [M+].