Pentane → 1,3-Dioxolan-4-one, 2-(1,1-dimethylethyl)-5-phenyl-, (2R,5R)-

HRID 1627415Notes

Reaction equation

HRID 1627415 reaction equation
[C:1]([OH:11])(=[O:10])[C@@H:2]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1)[OH:3].CCCCC.[CH3:17][C:18]([CH:21]=O)([CH3:20])[CH3:19].C([O-])(O)=O.[Na+]>FC(F)(F)S(O)(=O)=O>[C:18]([C@H:21]1[O:10][C:1](=[O:11])[C@@H:2]([C:4]2[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=2)[O:3]1)([CH3:20])([CH3:19])[CH3:17]

Participants

6

Reactant 4

HCID 8003PentaneHCID 11914(-)-Mandelic acidHCID 12417PivalaldehydeHCID 516892Sodium Bicarbonate

Product 1

HCID 110094971,3-Dioxolan-4-one, 2-(1,1-dimethylethyl)-5-phenyl-, (2R,5R)-Yield 88%

Reagents, catalysts & solvents 1

HCID 62406Trifluoromethanesulfonic acidCatalyst

Conditions

Temperature
36 °C

Procedure

(R)-Mandelic acid (20 g, 130 mmol) was dissolved in anhydrous pentane (200 mL, 1.7 mol). Pivaldehyde (13.6 g, 153 mmol) was added followed by trifluoromethanesulfonic acid (488 μL, 5.4 mmol). The reaction was allowed to reflux at 36° C. under nitrogen. After 5.5 hours, the mixture was allowed to cool to room temperature before stirring with 200 mL of an 8 wt % NaHCO3 solution for 10 minutes. Excess pentane was removed by rotary evaporation. The solids were collected by filtration and rinsed (100 mL water) while under vacuum filtration. The solids were dried overnight under high vacuum to yield intermediate (1a) as a white solid (23.8 g, 88% purity).

Workup

  1. temperatureto cool to room temperature
  2. customExcess pentane was removed by rotary evaporation
  3. filtrationThe solids were collected by filtration
  4. washrinsed (100 mL water)
  5. filtrationwhile under vacuum filtration
  6. customThe solids were dried overnight under high vacuum

Sources & evidence

ORD record
ord-bc5a2bf2fb17433b9f02590e37599e57
Source dataset
uspto-grants-2014_07
Patent number
US08785633B2

Reaction notes

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