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Chlorotrimethylsilane → {(S)-6-[(R)-5-cyano-4-(2,6-dimethyl-benzyl)-indan-1-yloxy]-2,3-dihydro-benzofuran-3-yl}-acetic acid methyl ester

HRID 2406514
Notes
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Reaction equation

HRID 2406514 reaction equation
[Li+].[Cl-].BrCCBr.C[Si](Cl)(C)C.[CH3:12][C:13]1[CH:20]=[CH:19][CH:18]=[C:17]([CH3:21])[C:14]=1[CH2:15]Br.[CH3:22][O:23][C:24](=[O:48])[CH2:25][C@H:26]1[C:30]2[CH:31]=[CH:32][C:33]([O:35][C@H:36]3[C:44]4[C:39](=[C:40](Br)[C:41]([C:45]#[N:46])=[CH:42][CH:43]=4)[CH2:38][CH2:37]3)=[CH:34][C:29]=2[O:28][CH2:27]1.[NH4+].[Cl-]>O1CCCC1.C(C1C=CC=C(C(C)C)C=1N1C=CN(C2C(C(C)C)=CC=CC=2C(C)C)C1=[Pd-3](Cl)(Cl)C1C(Cl)=CC=CN=1)(C)C.[Zn]>[CH3:22][O:23][C:24](=[O:48])[CH2:25][C@H:26]1[C:30]2[CH:31]=[CH:32][C:33]([O:35][C@H:36]3[C:44]4[C:39](=[C:40]([CH2:15][C:14]5[C:17]([CH3:21])=[CH:18][CH:19]=[CH:20][C:13]=5[CH3:12])[C:41]([C:45]#[N:46])=[CH:42][CH:43]=4)[CH2:38][CH2:37]3)=[CH:34][C:29]=2[O:28][CH2:27]1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

10

Reactant 6

HCID 6397ChlorotrimethylsilaneHCID 78391,2-DibromoethaneHCID 25517Ammonium ChlorideHCID 433294Lithium ChlorideHCID 139291242-(Bromomethyl)-1,3-dimethylbenzeneHCID 86700771{(S)-6-[(R)-4-bromo-5-cyano-indan-1-yloxy]-2,3-dihydro-benzofuran-3-yl}-acetic acid methyl ester

Product 1

HCID 86700779{(S)-6-[(R)-5-cyano-4-(2,6-dimethyl-benzyl)-indan-1-yloxy]-2,3-dihydro-benzofuran-3-yl}-acetic acid methyl ester

Reagents, catalysts & solvents 3

HCID 23994ZincCatalyst2×HCID 8028TetrahydrofuranSolvent3×HCID 178439029HCID 178439029, compoundSolvent

Procedure

A flask charged with a stir bar and anhydrous LiCl (49 mg) is heated to 180° C. under high vacuum (ca. 1 mbar). After 30 min the flask is cooled to room temperature, filled with Ar, and Zn powder (84 mg) is added under Ar atmosphere. The flask is reevacuated (ca. 1 mbar) and heated to 180° C. After another 30 min the flask is cooled to room temperature and filled with Ar again. Tetrahydrofuran (dry, 0.5 mL) is added and the Zn is activated with 1,2-dibromoethane (2 μL) and trimethylsilyl chloride (1.5 μL) (for comparison see e.g. Synthesis 2009, 681-6). A solution of 2,6-dimethylbenzyl bromide (0.23 g) in tetrahydrofuran (dry, 2 mL) is added dropwise. The mixture is stirred for 30 min prior to addition of {(S)-6-[(R)-4-bromo-5-cyano-indan-1-yloxy]-2,3-dihydro-benzofuran-3-yl}-acetic acid methyl ester (0.10 g) in tetrahydrofuran (dry, 2 mL) and [1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene]-(3-chloropyridyl)-palladium(II) dichloride (Pd-PEPPSI-IPr, 20 mg). The mixture is heated to 60° C. and stirred at this temperature overnight. After cooling to room temperature, aqueous NH4Cl solution is added and the resulting mixture is extracted with ethyl acetate. The combined extracts are dried (MgSO4) and concentrated. The residue is purified by HPLC on reversed phase (MeCN/water/NH4OH) to give the title compound. LC (method 4): tR=1.28 min; Mass spectrum (ESI+): m/z=468 [M+H]+.

Workup

  1. additionA flask charged with a stir bar
  2. additionis added under Ar atmosphere
  3. temperatureheated to 180° C
  4. temperatureAfter another 30 min the flask is cooled to room temperature
  5. additionfilled with Ar again
  6. temperatureThe mixture is heated to 60° C.
  7. stirringstirred at this temperature overnight
  8. temperatureAfter cooling to room temperature
  9. extractionthe resulting mixture is extracted with ethyl acetate
  10. dry with materialThe combined extracts are dried (MgSO4)
  11. concentrationconcentrated
  12. customThe residue is purified by HPLC on reversed phase (MeCN/water/NH4OH)

Sources & evidence

ORD record
ord-c6e0b1b94f524bf789690c891b4e5802
Source dataset
uspto-grants-2014_08
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08809376B2

Reaction notes

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