Hydrochloric Acid → 2-[2-Amino-2-(3-bromo-phenyl)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester

HRID 2196255Notes

Reaction equation

[CH3:1][O:2][C:3](=[O:24])[C:4]([O:10][CH2:11][C:12]([N:21]=[N+]=[N-])([C:14]1[CH:19]=[CH:18][CH:17]=[C:16]([Br:20])[CH:15]=1)[CH3:13])([CH3:9])[C:5]([F:8])([F:7])[F:6].[In].Cl.C([O-])([O-])=O.[K+].[K+]>C1COCC1.O>[CH3:1][O:2][C:3](=[O:24])[C:4]([O:10][CH2:11][C:12]([NH2:21])([C:14]1[CH:19]=[CH:18][CH:17]=[C:16]([Br:20])[CH:15]=1)[CH3:13])([CH3:9])[C:5]([F:8])([F:7])[F:6]

Participants

Conditions

Temperature: 25 °C

Procedure

To a solution of the 2-[2-azido-2-(3-bromo-phenyl)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester (4.2 g, 9.22 mmol) in THF-H2O 3:1 (48 ml) was added indium (2.116 g, 18.43 mmol) followed by 4N aqueous HCl over a period of 20 min and stirring for 1 h at 25° C. The reaction mixture was added to a 10% aqueous K2CO3 solution and the product was extracted with EtOAc. The combined organic layers were washed with brine, dried over MgSO4, filtered and evaporated. The crude product was purified by flash-chromatography on NEt3 deactivated silica gel (hexane/EtOAc 2:1 to EtOAc) to provide a diastereomeric mixture of the title compound as a yellow oil: TLC (EtOAc): Rf=0.46; HPLC RtH5=0.999 min; 1H NMR (360 MHz, CDCl3): δ 7.73 (s, 1H), 7.47 (d, 1H), 7.41 (d, 1H), 7.24 (t, 1H), 3.84 and 3.83 (s, 3H), 3.59 (s, 2H), 1.61 and 1.59 (s, 3H), 1.52 and 1.51 (s, 3H); ESIMS: 384, 386 [(M+H)+].

Workup

extractionthe product was extracted with EtOAc
washThe combined organic layers were washed with brine
dry with materialdried over MgSO4
filtrationfiltered
customevaporated
customThe crude product was purified by flash-chromatography on NEt3 deactivated silica gel (hexane/EtOAc 2:1 to EtOAc)
customto provide

Sources & evidence

ORD record: ord-1ed5bedd54bf4b0c90775c2164d5a020
Source dataset: uspto-grants-2012_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08338413B1

Reaction notes

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