Isopropanol → (S)-2-amino-1-(3-chlorophenyl)ethanol

HRID 470316Notes

Reaction equation

[N:1]([CH2:4][C@H:5]([C:7]1[CH:12]=[CH:11][CH:10]=[C:9]([Cl:13])[CH:8]=1)[OH:6])=[N+]=[N-].[BH4-].[Na+].C(O)(C)C>CO>[NH2:1][CH2:4][C@H:5]([C:7]1[CH:12]=[CH:11][CH:10]=[C:9]([Cl:13])[CH:8]=1)[OH:6]

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of (S)-2-Azido-1-(3-chlorophenyl)-ethanol (5.14 g, 0.026 mol), NaBH4 (1.97 g, 0.052 mol) and isopropanol (100 ml) was stirred at 80° C. for 24 h. The solvent was evaporated, the residue was separated on SiO2 (15 g) CHCl3-MeOH (0 to 30%). Colorless oil, 3.70 g (0.021 mol, 83%). The material was reacted with Boc2O in dichloromethane and NEt3 and analyzed by chiral SFC using a CHIRALPAK AD-H column, 30% MeOH and determined to be 91% ee. LCMS [M+H]+ 172.4. 1H NMR (300 MHz, DMSO) δ 7.24-7.39 (m, 4H), 4.46 (dd, J=4.3, 7.5 Hz, 1H), 2.68 (dd, J=4.3, 12.8 Hz, 1H), 2.57 (dd, J=7.5, 13.0 Hz, 1H).

Workup

customThe solvent was evaporated
customthe residue was separated on SiO2 (15 g) CHCl3-MeOH (0 to 30%)
customThe material was reacted with Boc2O in dichloromethane and NEt3

Sources & evidence

ORD record: ord-e7779d3ab6744d25b7b6933694c9b414
Source dataset: uspto-grants-2014_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08629147B2

Reaction notes

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