Cesium fluoride → 2-(4-Benzo[1,2,5]oxadiazol-5-yl-3-chloro-5-cyclopropylmethoxy-phenyl)-4-methyl-pentanoic acid cyclopropylmethyl ester

HRID 385352Notes

Reaction equation

HRID 385352 reaction equation
[CH:1]1([CH2:4][O:5][C:6](=[O:25])[CH:7]([C:12]2[CH:17]=[C:16]([O:18][CH2:19][CH:20]3[CH2:22][CH2:21]3)[C:15](I)=[C:14]([Cl:24])[CH:13]=2)[CH2:8][CH:9]([CH3:11])[CH3:10])[CH2:3][CH2:2]1.CC1(C)C(C)(C)OB([C:34]2[CH:35]=[CH:36][C:37]3[C:38]([CH:42]=2)=[N:39][O:40][N:41]=3)O1.[F-].[Cs+].O.CCOC(C)=O>COCCOC.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[CH:1]1([CH2:4][O:5][C:6](=[O:25])[CH:7]([C:12]2[CH:17]=[C:16]([O:18][CH2:19][CH:20]3[CH2:22][CH2:21]3)[C:15]([C:34]3[CH:35]=[CH:36][C:37]4[C:38]([CH:42]=3)=[N:39][O:40][N:41]=4)=[C:14]([Cl:24])[CH:13]=2)[CH2:8][CH:9]([CH3:11])[CH3:10])[CH2:3][CH2:2]1

Participants

7

Reactant 4

HCID 25953Cesium fluorideHCID 22728543Water ethylacetateHCID 467380042,1,3-Benzoxadiazole-5-boronic acid, pinacol esterHCID 579956062-(3-Chloro-5-cyclopropylmethoxy-4-iodo-phenyl)-4-methyl-pentanoic acid cyclopropylmethyl ester

Product 1

HCID 579956022-(4-Benzo[1,2,5]oxadiazol-5-yl-3-chloro-5-cyclopropylmethoxy-phenyl)-4-methyl-pentanoic acid cyclopropylmethyl esterYield 41.2%

Reagents, catalysts & solvents 2

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
100 °C

Procedure

To a solution of 2-(3-chloro-5-cyclopropylmethoxy-4-iodo-phenyl)-4-methyl-pentanoic acid cyclopropylmethyl ester (0.27 g, 0.57 mmol) in DME (anhydrous, 10 mL) under argon atmosphere were added 5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzo[1,2,5]oxadiazole (0.15 g, 0.61 mmol), CsF (0.2 g, 1.32 mmol), and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium (II) (0.021 g, 0.029 mmol, need 0.06 mmol to complete the reaction!). The reaction mixture was refluxed for 18 h (oil bath, 100° C.). A mixture water/EtOAc (15 mL/15 mL) was added and the layers were separated. The organic phase was dried over MgSO4, then evaporated to give a crude yellow oil, which was purified by silica gel gradient column chromatography using Heptane-EtOAc (20:1-9:1) to give 2-(4-benzo[1,2,5]oxadiazol-5-yl-3-chloro-5-cyclopropylmethoxy-phenyl)-4-methyl-pentanoic acid cyclopropylmethyl ester (0.11 g, 41%) of as a yellowish oil. 1H NMR (300 MHz, CDCl3/TMS): δ 7.83 (d, J=9.3 Hz, 1H), 7.77 (s, 1H), 7.36-7.33 (m, 1H), 7.11 (s, 1H), 6.91 (s, 1H), 4.02-3.81 (m, 4H), 3.67 (t, J=7.7 Hz, 1H), 2.03-1.96 (m, 1H), 1.74-1.65 (m, 1H), 1.60-1.45 (m, 1H), 1.20-1.05 (m, 2H), 0.96 (d, J=6.3 Hz, 6H), 0.57-0.47 (m, 4H), 0.28 (br s, 2H), 0.19 (br s, 2H). 13C NMR (75 MHz, CDCl3/TMS): δ 173.4, 157.0, 149.2, 148.3, 142.0, 138.7, 135.4, 133.5, 126.4, 121.6, 117.4, 114.9, 110.6, 73.4, 69.8, 49.8, 42.8, 26.1, 22.5, 22.4, 10.0, 9.8, 3.3, 3.1

Workup

  1. customthe reaction
  2. customthe layers were separated
  3. dry with materialThe organic phase was dried over MgSO4
  4. customevaporated
  5. customto give a crude yellow oil, which
  6. customwas purified by silica gel gradient column chromatography

Sources & evidence

ORD record
ord-6c7dd735a7164873972ddf0ea656944f
Source dataset
uspto-grants-2013_02
Patent number
US08367863B2

Reaction notes

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