Methanol → HCID 19761822, compound
Reaction equation
[OH:1][CH:2]([CH2:7][CH:8]([OH:15])[CH2:9][C:10]([O:12][CH2:13][CH3:14])=[O:11])[C:3]([O:5][CH3:6])=[O:4].CO[C:18](OC)([CH3:20])[CH3:19].C1(C)C=CC(S([O-])(=O)=O)=CC=1.[NH+]1C=CC=CC=1.CO>C(Cl)Cl>[CH3:6][O:5][C:3]([CH:2]1[CH2:7][CH:8]([CH2:9][C:10]([O:12][CH2:13][CH3:14])=[O:11])[O:15][C:18]([CH3:20])([CH3:19])[O:1]1)=[O:4]Participants
Procedure
To a solution of 1-methyl 6-ethyl 2,4-dihydroxyadipate (1.5 g, 6.81 mmol) in methylene chloride (60 ml), dimethoxypropane (1.672 ml, 78 mmol) and pyridinium p-toluenesulfonate (251 mg, 1 mmol) were added and stirred under reflux conditions for one hour, followed by further stirring at 50° C. for one hour while azeotropically removing methanol with methylene chloride. Then, after adding methylene chloride (60 ml), the mixture was again stirred at 50° C. for one hour to remove methylene chloride (50 ml). To the residue, water was added, and the mixture was extracted with methylene chloride. The organic layers were combined, dried over sodium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography (hexane:acetone=5:1) to give pure 2-methoxycarbonyl-4-ethoxycarbonylmethyl-6,6-dimethyl-1,5-dioxane (1.29 g, 4.99 mmol). Yield, 73 %.
Workup
- stirringthe mixture was again stirred at 50° C. for one hour
- customto remove methylene chloride (50 ml)
- additionTo the residue, water was added
- extractionthe mixture was extracted with methylene chloride
- dry with materialdried over sodium sulfate
- concentrationconcentrated under reduced pressure
Sources & evidence
- ORD record
- ord-727f0fc43dde46ddbc63bc7e76c0c6af
- Source dataset
- uspto-grants-1993_05
- Patent number
- US05214197
Reaction notes
Loading…