Trifluoroacetic acid → HCID 89686710, compound

HRID 520394Notes

Reaction equation

O[C:2]1([C:8]([CH3:20])([CH3:19])[C:9]([O:11][CH2:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[O:10])[CH2:7][CH2:6][CH2:5][CH2:4][O:3]1.C([SiH](CC)CC)C.C(O)(C(F)(F)F)=O>>[CH3:20][C:8]([CH:2]1[CH2:7][CH2:6][CH2:5][CH2:4][O:3]1)([CH3:19])[C:9]([O:11][CH2:12][C:13]1[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=1)=[O:10]

Participants

Reactant 3

HCID 6422Trifluoroacetic acid

HCID 12052Triethylsilane

HCID 10423678HCID 10423678, compound

Product 1

HCID 89686710HCID 89686710, compound

Procedure

A stirred suspension of benzyl 2-bromo-2-methylpropanoate (0.748 g, 2.91 mmol), tetrahydro-2H-pyran-2-one (0.260 g, 2.60 mmol) and indium (0.341 g, 2.97 mmol) in THF (3 mL) was sonicated for 6 h. The reaction was quenched with sat. NaHCO3 and extracted with ether, then concentrated. The residue was purified by silica gel flash chromatography to afford benzyl 2-(2-hydroxytetrahydro-2H-pyran-2-yl)-2-methylpropanoate. 1H NMR (500 MHz, CDCl3) δ ppm 7.30-7.43 (5H, m), 5.18 (2H, s), 3.51-3.61 (2H, m), 2.41 (2H, t, J=7.10 Hz), 1.56-1.66 (2H, m), 1.35-1.47 (8H, m). Benzyl 2-(2-hydroxytetrahydro-2H-pyran-2-yl)-2-methylpropanoate was dissolved in triethylsilane (0.415 mL, 2.60 mmol) and treated with TFA (0.200 mL, 2.60 mmol) and the reaction mixture was stirred at rt for 16 h, then evaporated to dryness to yield benzyl 2-methyl-2-(tetrahydro-2H-pyran-2-yl)propanoate. 1H NMR (500 MHz, CDCl3) δ ppm 7.30-7.41 (5H, m), 5.22 (1H, d, J=12.66 Hz), 5.10 (1H, d, J=12.51 Hz), 3.91-4.01 (1H, m), 3.53 (1H, dd, J=11.22, 1.75 Hz), 3.39 (1H, td, J=11.56, 2.37 Hz), 1.82-1.92 (1H, m), 1.44-1.59 (4H, m), 1.30-1.41 (1H, m), 1.19-1.25 (3H, m), 1.11-1.19 (3H, m). A stirred suspension of 10% Pd—C (16.63 mg) and benzyl 2-methyl-2-(tetrahydro-2H-pyran-2-yl)propanoate (82 mg, 0.313 mmol) in EtOAc (5 mL) was stirred under H2 for 6 h, and then filtered and concentrated to yield Cap P-23 (54 mg). 1H NMR (500 MHz, CDCl3) δ ppm 4.09-4.19 (1H, m), 3.48-3.57 (1H, m), 3.33-3.42 (1H, m), 1.88-1.97 (1H, m), 1.71 (1H, d, J=13.12 Hz), 1.47-1.65 (3H, m), 1.29-1.40 (1H, m), 1.23-1.27 (3H, m), 1.14-1.20 (3H, m).

Workup

customevaporated to dryness

Sources & evidence

ORD record: ord-81922706a4e74a848fa4590a768f17b3
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09326973B2

Reaction notes

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