Tributylphosphine → {(S)-6-[(R)-4-bromo-7-fluoro-indan-1-yloxy]-2,3-dihydro-benzofuran-3-yl}-acetic acid methyl ester

HRID 237436Notes

Reaction equation

HRID 237436 reaction equation
N(C(OC(C)(C)C)=O)=NC(OC(C)(C)C)=O.[OH:17][C:18]1[CH:31]=[CH:30][C:21]2[C@H:22]([CH2:25][C:26]([O:28][CH3:29])=[O:27])[CH2:23][O:24][C:20]=2[CH:19]=1.[Br:32][C:33]1[CH:41]=[CH:40][C:39]([F:42])=[C:38]2[C:34]=1[CH2:35][CH2:36][C@@H:37]2O.C(P(CCCC)CCCC)CCC>O1CCCC1>[Br:32][C:33]1[CH:41]=[CH:40][C:39]([F:42])=[C:38]2[C:34]=1[CH2:35][CH2:36][C@H:37]2[O:17][C:18]1[CH:31]=[CH:30][C:21]2[C@H:22]([CH2:25][C:26]([O:28][CH3:29])=[O:27])[CH2:23][O:24][C:20]=2[CH:19]=1

Participants

6

Reactant 4

HCID 13831TributylphosphineHCID 97268Di-tert-butyl azodicarboxylateHCID 53393313(S)-Methyl 2-(6-hydroxy-2,3-dihydrobenzofuran-3-yl)acetateHCID 86697104(S)-4-bromo-7-fluoro-2,3-dihydro-1H-inden-1-ol

Product 1

HCID 86697103{(S)-6-[(R)-4-bromo-7-fluoro-indan-1-yloxy]-2,3-dihydro-benzofuran-3-yl}-acetic acid methyl ester

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

A solution of di-tert.-butyl azodicarboxylate (18 g) in tetrahydrofuran (80 mL) is added dropwise over 45 minutes to a solution of (S)-methyl 2-(6-hydroxy-2,3-dihydrobenzofuran-3-yl)acetate (11 g), (S)-4-bromo-7-fluoro-2,3-dihydro-1H-inden-1-ol (11.95 g) and tributylphosphine (19.3 mL) in tetrahydrofuran (320 mL) at −10° C. The resulting solution is stirred for 30 minutes and then partitioned between saturated aqueous NaHCO3 solution and dichloromethane. The aqueous phase is extracted with dichloromethane. The combined organic phases are dried (MgSO4) and concentrated. The residue is chromatographed on silica gel (cyclohexane/ethyl acetate 90:10→70:30) to give the title compound. Yield: 10.35 g; LC (method 1): tR=1.41 min; Mass spectrum (ESI+): m/z=421 [M+H]+.

Workup

  1. custompartitioned between saturated aqueous NaHCO3 solution and dichloromethane
  2. extractionThe aqueous phase is extracted with dichloromethane
  3. dry with materialThe combined organic phases are dried (MgSO4)
  4. concentrationconcentrated
  5. customThe residue is chromatographed on silica gel (cyclohexane/ethyl acetate 90:10→70:30)

Sources & evidence

ORD record
ord-5f14dd3290f6417f989c945967d76d9e
Source dataset
uspto-grants-2014_02
Patent number
US08642585B2

Reaction notes

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