Lithium borohydride → (1S,2R,3R,4S)-3,4-Bis(hydroxymethyl)-2-(2-methylphenyl)cyclohexanol

HRID 1644775Notes

Reaction equation

[OH:1][C@H:2]1[CH2:7][CH2:6][C@H:5]([C:8](OCC)=[O:9])[C@@H:4]([C:13](OCC)=[O:14])[C@@H:3]1[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][C:19]=1[CH3:24].[Li+].[BH4-]>C1COCC1>[OH:14][CH2:13][C@@H:4]1[C@@H:5]([CH2:8][OH:9])[CH2:6][CH2:7][C@H:2]([OH:1])[C@H:3]1[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][C:19]=1[CH3:24]

Participants

Conditions

Temperature: 75 °C

Procedure

To a solution of diethyl (1S,2S,3R,4S)-4-hydroxy-3-(2-methylphenyl)cyclohexane-1,2-dicarboxylate (Step G, 64.1 g, 192 mmol) in 250 mL THF under nitrogen atmosphere was slowly added LiBH4 powder (16.7 g, 767 mmol, excess) at 0° C. The resulting mixture was heated at 75° C. for 12 hr then cooled to RT. The reaction mixture was carefully quenched by addition of 30 mL water at 0° C., then 30 mL 2 N hydrochloric acid. The organic layer was separated and the aqueous was extracted with EtOAc. The combined organic extracts were washed with aqueous NaHCO3, dried over Na2SO4, filtered and the solvent evaporated under vacuum to give 43.7 g of the crude title compound which was used without further purification. 1H-NMR (CDCl3): δ: 7.30-7.13 (4H, m), 3.93-3.68 (3H, m), 3.53 (1H, dd, J1=11.2 Hz, J2=2.3 Hz), 3.27 (1H, dd, J1=11.2 Hz, J2=5.1 Hz), 2.85 (1H, t, J=10.5 Hz), 2.39 (3H, s), 2.19 (1H, m), 1.86 (3H, bs), 1.67 (2H, m), 1.55 (1H, m), 1.45 (1H, m).

Workup

customat 0° C
temperaturethen cooled to RT
customThe reaction mixture was carefully quenched by addition of 30 mL water at 0° C.
customThe organic layer was separated
extractionthe aqueous was extracted with EtOAc
washThe combined organic extracts were washed with aqueous NaHCO3
dry with materialdried over Na2SO4
filtrationfiltered
customthe solvent evaporated under vacuum

Sources & evidence

ORD record: ord-14bc70c667fd4cf9bae7b7a2529b5201
Source dataset: uspto-grants-2012_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08124633B2

Reaction notes

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