Acetonitrile → Benzyl 4,5-dichloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)picolinate

HRID 1424661Notes

Reaction equation

HRID 1424661 reaction equation
[Cl:1][C:2]1[C:7]([Cl:8])=[C:6](Cl)[N:5]=[C:4]([C:10]([O:12][CH2:13][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)=[O:11])[CH:3]=1.[Cl:20][C:21]1[CH:26]=[CH:25][C:24](B2OCCCO2)=[C:23]([F:33])[C:22]=1[O:34][CH3:35].[F-].[Cs+].C(#N)C>Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.O>[Cl:1][C:2]1[C:7]([Cl:8])=[C:6]([C:24]2[CH:25]=[CH:26][C:21]([Cl:20])=[C:22]([O:34][CH3:35])[C:23]=2[F:33])[N:5]=[C:4]([C:10]([O:12][CH2:13][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)=[O:11])[CH:3]=1

Participants

7

Reactant 4

HCID 6342AcetonitrileHCID 25953Cesium fluorideHCID 577824192-(4-Chloro-2-fluoro-3-methoxyphenyl)-1,3,2-dioxaborinaneHCID 86668437Benzyl 4,5,6-trichloropicolinate

Product 1

HCID 70495430Benzyl 4,5-dichloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)picolinate

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 962WaterSolvent

Procedure

A 250 mL three-neck flask equipped with a reflux condenser and nitrogen inlet was charged with benzyl 4,5,6-trichloropicolinate (17.77 g, 56.10 mmol), 2-(4-chloro-2-fluoro-3-methoxyphenyl)-1,3,2-dioxaborinane (19.20 g, 79.0 mmol) and CsF (17.04 g, 112.0 mmol). Acetonitrile (100 mL) and water (30 mL) were added. The reaction mixture was evacuated/backfilled with nitrogen (5×). Solid Pd(PPh3)2Cl2 (1.724 g, 2.456 mmol) was added. The solution was evacuated/backfilled with nitrogen (5×) and then stirred at reflux for 90 min. A white solid precipitated upon cooling to room temperature. The solid was filtered, washed with water and dried in air (18.66 g, 75%): 1H NMR (400 MHz, CDCl3) δ 8.23 (s, 1H, pyridine H), 7.52-7.32 (m, 5H, phenyl), 7.27 (dd, JH-H=8.4 Hz, JF-H=1.7 Hz, 1H, aromatic), 7.10 (dd, JH-H=8.4 Hz, JF-H=6.8 Hz, 1H, aromatic), 5.44 (s, 2H, CH2Ph), 3.98 (d, J JF-H=1.3 Hz, 3H, OMe); 13C{1H} NMR (101 MHz, CDCl3) δ 163.0, 153.7, 153.5 (d, JF-C=253 Hz, C2′), 146.0, 144.5 (d, JF-C=13 Hz), 144.1, 135.0, 134.2, 129.9 (d, JF-C=3 Hz), 128.5, 126.1, 125.8 (d, JF-C=14 Hz), 125.3 (d, JF-C=3 Hz), 124.9 (d, JF-C=2 Hz), 67.9 (CH2), 61.5 (d, JF-C=4 Hz, OMe). Anal. Calcd for C20H13Cl3FNO3: C, 54.51; H, 2.97; N, 3.18. Found: C, 54.60; H, 3.08; N, 3.16.

Workup

  1. customA 250 mL three-neck flask equipped with a reflux condenser and nitrogen inlet
  2. temperatureat reflux for 90 min
  3. customA white solid precipitated
  4. filtrationThe solid was filtered
  5. washwashed with water
  6. customdried in air (18.66 g, 75%)

Sources & evidence

ORD record
ord-1e3c58be5e9a4ceab6ebbc49f06a35fd
Source dataset
uspto-grants-2015_01
Patent number
US08927731B2

Reaction notes

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