Potassium Carbonate → 4-(2-Formyl-4-iodo-phenoxy)-piperidine-1-carboxylic acid tert-butyl ester

HRID 1095067Notes

Reaction equation

[I:1][C:2]1[CH:9]=[C:6]([CH:7]=[O:8])[C:5]([OH:10])=[CH:4][CH:3]=1.C([O-])([O-])=O.[K+].[K+].[C:17]([O:21][C:22]([N:24]1[CH2:29][CH2:28][CH:27](OS(C2C=CC(C)=CC=2)(=O)=O)[CH2:26][CH2:25]1)=[O:23])([CH3:20])([CH3:19])[CH3:18]>CN(C)C=O.C(OCC)(=O)C>[C:17]([O:21][C:22]([N:24]1[CH2:29][CH2:28][CH:27]([O:10][C:5]2[CH:4]=[CH:3][C:2]([I:1])=[CH:9][C:6]=2[CH:7]=[O:8])[CH2:26][CH2:25]1)=[O:23])([CH3:20])([CH3:18])[CH3:19]

Participants

Conditions

Temperature: 60 °C

Procedure

To a solution of 5-iodosalicylaldehyde (3 g, 12.1 mmol) (Aldrich) in N,N-dimethylformamide (20 mL) was added anhydrous K2CO3 (5 g, 36.3 mmol), and 4-(toluene-4-sulfonyloxy)-piperidine-1-carboxylic acid tert-butyl ester (5.4 g, 18.1 mmol, ASTATECH). The reaction mixture was heated at 60° C. for 18 h. The mixture was cooled to room temperature, diluted with ethyl acetate, washed with water. The organic layer was separated, the aqueous layer was extracted with ethyl acetate. The organic layers were combined, washed with water, brine, dried over MgSO4, and concentrated to give crude 4-(2-formyl-4-iodo-phenoxy)-piperidine-1-carboxylic acid tert-butyl ester as a yellow oil (Yield 4.38 g, 84%).

Workup

temperatureThe mixture was cooled to room temperature
washwashed with water
customThe organic layer was separated
extractionthe aqueous layer was extracted with ethyl acetate
washwashed with water, brine
dry with materialdried over MgSO4
concentrationconcentrated

Sources & evidence

ORD record: ord-cc2c979b317247feb5c24eb3d60a086a
Source dataset: uspto-grants-2012_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08134001B2

Reaction notes

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