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Synlett 2018; 29(04): 483-488
DOI: 10.1055/s-0036-1590961
DOI: 10.1055/s-0036-1590961
letter
An Efficient Cyanide-Free Approach towards 1-(2-Pyridyl)isoquinoline-3-carbonitriles via the Reaction of 5-Phenacyl-1,2,4-triazines with 1,2-Dehydrobenzene in the Presence of Alkyl Nitrites
We are pleased to acknowledge the Russian Science Foundation (Ref. # 16-43-02020) for funding. A. Majee acknowledges financial support from the DST-RSF Major Research Project (Ref. No. INT/RUS/RSF/P-08).
Weitere Informationen
Publikationsverlauf
Received: 16. Oktober 2017
Accepted: 24. Oktober 2017
Publikationsdatum:
28. November 2017 (online)
Abstract
A cyanide-free method for the preparation of 1-(2-pyridyl)isoquinoline-3-carbonitriles (3-cyanoisoquinolines) was developed. The interaction of 5-phenacyl-3-(2-pyridyl)-1,2,4-triazines with 1,2-dehydrobenzene generated in situ from anthranilic acid and an excess of amyl nitrites afforded the target compounds in good yields. The proposed mechanism involves the in situ transformation of the 5-phenacyl group into the 5-cyano group under the action of alkyl nitrite and the following inverse demand aza-Diels–Alder reaction of thus formed 5-cyano-1,2,4-triazines with 1,2-dehydrobenzene affording the target products. The presence of the 5-phenacyl substituent is a key for the reaction, as in case of 5-styryl- or 5-phenylethynyl-3-(2-pyridyl)-1,2,4-triazines the formation of the 1,2,4-triazine ring-transformation products was observed
Key words
1-(2-pyridyl)isoquinoline-3-carbonitriles - cyanide-free - aryne - inverse demand aza-Diels–Alder reaction - alkyl nitritesSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0036-1590961.
- Supporting Information
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References and Notes
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- 24 Representative Synthetic Procedure for 4-Arylisoquinoline-3-carbonitriles 6 Corresponding 1,2,4-triazines 1, 4, or 9d (1.0 mmol) were suspended in dry toluene (60 mL). iso-Amyl nitrite or n-amyl nitrite (0.47 mL, 3.5 mmol) was added at once. The resulting mixture was stirred under reflux while the solution of anthranilic acid (3.5 mmol) in dry 1,4-dioxane (15 mL) was added dropwise for 30 min. The reaction mixture was heated under reflux for an additional hour and then cooled to room temperature. After that the reaction mixture was washed with 3 M aq KOH solution (3 × 50 mL), dried with anhydrous Na2SO4. After the filtration and evaporation of the solvents under reduced pressure the obtained residue was purified by column chromatography (silica gel) using the corresponding eluent. 1-(Pyridin-2-yl)-4-phenylisoquinoline-3-carbonitrile (6a) Eluent: DCM/EtOAc (3:1); Rf = 0.4; yield 230 mg (75%); mp 171–173 °С. 1Н NMR (400 MHz, DMSO-d 6): δ = 7.53–7.60 (m, 3 H, Ph), 7.62–7.69 (m, 3 H, Ph, H-5 (py)), 7.72–7.76 (m, 1 H, isoquin.), 7.82–7.87 (m, 2 H, isoquin.), 8.06 (ddd, 1 Н, J = 7.8, 7.8, 2.0 Hz, Н-4 (py)), 8.12 (dd, 1 Н, J = 7.8, 0.8 Hz, Н-3 (py)), 8.80 (dd, 1 Н, J = 4.8, 2.0 Hz, Н-6 (py)), 8.90–8.94 (m, 1 H, isoquin.). 13C NMR (100 MHz, CDCl3): δ = 117.6, 123.9, 125.4, 125.6, 126.5, 127.5, 128.6, 128.9, 129.4, 130.1, 130.2, 131.4, 133.8, 135.9, 137.3, 140.5, 148.7, 157.0. IR (neat): 2227 cm–1 (CN). MS (ESI): m/z [M + H]+ calcd for С21Н14N3 +: 308.12; found: 308.12. Anal. Calcd (%) for C21H13N3: C, 82.07; H, 4.26; N, 13.67. Found: C, 81.88; H, 4.03; N, 13.32. 4-(4-Methoxyphenyl)-1-(pyridine-2-yl)isoquinoline-3-carbonitrile (6b) Eluent: DCM/EtOAc (3:1); Rf = 0.5; yield 246 mg (73%); mp 175–177 °С. 1Н NMR (400 MHz, CDCl3): δ = 3.93 (s, 3 Н, ОМе), 7.13 (m, 2 Н, 4-MeOPh), 7.48 (m, 3 Н, 4-MeOPh, Н-5 (pу)), 7.75 (m, 2 Н, isoquin.), 7.85 (m, 1 Н, isoquin.), 7.97 (ddd, 1 Н, J = 7.8, 7.8, 2.0 Hz, Н-4 (pу)), 8.13 (dd, 1 Н, J = 7.8, 0.8 Hz, Н-3 (pу)), 8.82 (m, 2 Н, Н-6 (pу), isoquin.). IR (neat): 2228 cm–1 (CN). MS (ESI): m/z [M + H]+ calcd for С22Н16N3O+: 387.10; found: 387.10. Anal. Calcd (%) for C22H15N3O: C, 78.32; H, 4.48; N, 12.46. Found: C, 78.08; H, 4.24; N, 12.16. 4-(4-Chlorophenyl)-1-(pyridine-2-yl)isoquinoline-3-carbonitrile (6c) Eluent: DCM/EtOAc (3:1); Rf = 0.4; yield 252 mg (74%); mp 180–182 °С. 1Н NMR (400 MHz, CDCl3): δ = 7.45–7.51 (m, 3 H, H-5 (py), 4-chlorophenyl), 7.59 (m, 2 H, 4-chlorophenyl), 7.72–7.82 (m, 3 H, isoquin.), 7.97 (ddd, 1 Н, J = 7.8, 7.8, 2.0 Hz, Н-4 (py)), 8.13 (dd, 1 Н, J = 7.8, 0.8 Hz, Н-3 (py)), 8.81 (dd, 1 Н, J = 4.8, 2.0 Hz, Н-6 (py)), 8.87 (m, 1 H, isoquin.). IR (neat): 2226 cm–1 (CN). MS (ESI): m/z [M + H]+ calcd for С21Н13ClN3 +: 342.08; found: 342.08. Anal. Calcd (%) for C21H12ClN3: C, 73.79; H, 3.54; N, 12.29. Found: C, 73.62; H, 3.38; N, 12.38.
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