Toluene → 4-chloro-2-(5-chloropyridin-3-yl)-6,7-dihydro-5H-cyclopenta[b]pyridine

HRID 1508797Notes

Reaction equation

Cl[C:2]1[N:7]=[C:6]2[CH2:8][CH2:9][CH2:10][C:5]2=[C:4]([Cl:11])[CH:3]=1.[Cl:12][C:13]1[CH:14]=[C:15](B(O)O)[CH:16]=[N:17][CH:18]=1.C([O-])([O-])=O.[Cs+].[Cs+].C1(C)C=CC=CC=1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O.CCO>[Cl:11][C:4]1[CH:3]=[C:2]([C:15]2[CH:16]=[N:17][CH:18]=[C:13]([Cl:12])[CH:14]=2)[N:7]=[C:6]2[CH2:8][CH2:9][CH2:10][C:5]=12

Participants

Conditions

Temperature: 90 °C

Procedure

A 25-mL round bottom flask was charged with 2,4-dichloro-6,7-dihydro-5H-cyclopenta[b]pyridine (0.300 g, 1.59 mmol), 5-chloro3-pyridinyl boronic acid (0.301 g, 1.91 mmol), tetrakis(triphenylphosphine)palladium(0) (0.092 g, 0.08 mmol), and Cs2CO3 (1.56 g, 4.78 mmol). Toluene (8 ml), EtOH (2 ml) and water (4 ml) were added. The resulting mixture was stirred under Ar at 90° C. for 2.5 h. After this time, the mixture was cooled to rt, filtered through celite, and the filtrate concentrated under reduced pressure. The residue was purified by chromatography on silica using hexane/ethyl acetate (10:0 to 0:10) as eluent to afford the title compound (0.127 g, 30%) as a white solid. MW=265.14. 1H NMR (CDCl3, 500 MHz) δ 8.99 (d, J=2.0 Hz, 1H), 8.59 (d, J=2.5 Hz, 1H), 8.30 (t, J=2.5 Hz, 1H), 7.50 (s, 1H), 3.15 (t, J=7.5 Hz, 2H), 3.05 (t, J=7.5 Hz, 2H), 2.21 (quin, J=7.5 Hz, 2H).

Workup

temperatureAfter this time, the mixture was cooled to rt
filtrationfiltered through celite
concentrationthe filtrate concentrated under reduced pressure
customThe residue was purified by chromatography on silica

Sources & evidence

ORD record: ord-8b1048a02b6b45cd9a999fc965542307
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09221843B2

Reaction notes

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