Water → Methyl 1-(2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)cyclopropanecarboxylate

HRID 1964194Notes

Reaction equation

HRID 1964194 reaction equation
[CH3:1][O:2][C:3]([C:5]1([C:8]2[CH:13]=[CH:12][C:11]([OH:14])=[C:10]([NH2:15])[CH:9]=2)[CH2:7][CH2:6]1)=[O:4].Cl[C:17](Cl)([O:19]C(=O)OC(Cl)(Cl)Cl)Cl.O>C1COCC1>[CH3:1][O:2][C:3]([C:5]1([C:8]2[CH:13]=[CH:12][C:11]3[O:14][C:17](=[O:19])[NH:15][C:10]=3[CH:9]=2)[CH2:7][CH2:6]1)=[O:4]

Participants

5

Reactant 3

HCID 962WaterHCID 94429TriphosgeneHCID 591293241-(3-Amino-4-hydroxy-phenyl)-cyclopropanecarboxylic acid methyl ester

Product 1

HCID 59129179Methyl 1-(2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)cyclopropanecarboxylateYield 91%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 1-(3-amino-4-hydroxy-phenyl)-cyclopropanecarboxylic acid methyl ester (2.0 g, 9.6 mmol) in THF (40 mL) was added triphosgene (4.2 g, 14 mmol) at room temperature. The mixture was stirred for 20 minutes at this temperature before water (20 mL) was added dropwise at 0° C. The resulting mixture was extracted with EtOAc (100 mL×3). The combined organic layers were dried over anhydrous Na2SO4 and evaporated under vacuum to give 1-(2-oxo-2,3-dihydro-benzooxazol-5-yl)-cyclopropanecarboxylic acid methyl ester (2.0 g, 91%), which was directly used in the next step. 1H NMR (CDCl3, 300 MHz) δ 8.66 (s, 1 H), 7.13-7.12 (m, 2 H), 7.07 (s, 1 H), 3.66 (s, 3 H), 1.68-1.65 (m, 2 H), 1.24-1.20 (m, 2 H).

Workup

  1. additionwas added dropwise at 0° C
  2. extractionThe resulting mixture was extracted with EtOAc (100 mL×3)
  3. dry with materialThe combined organic layers were dried over anhydrous Na2SO4
  4. customevaporated under vacuum

Sources & evidence

ORD record
ord-47415c7e8e8a4e4680ab515ca61361b1
Source dataset
uspto-grants-2013_04
Patent number
US08415387B2

Reaction notes

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