Dicyclohexylcarbodiimide → HCID 20074083, compound

HRID 704432Notes

Reaction equation

HRID 704432 reaction equation
C1(N=C=NC2CCCCC2)CCCCC1.[C:16]([O:20][C:21]([N:23]1[CH:27]([C:28]([OH:30])=O)[CH2:26][S:25][CH:24]1[C:31]1[CH:32]=[N:33][CH:34]=[CH:35][CH:36]=1)=[O:22])([CH3:19])([CH3:18])[CH3:17].[CH3:37][CH:38]1[CH2:43][CH2:42][NH:41][CH2:40][CH2:39]1.ON1C2C=CC=CC=2N=N1>O1CCCC1.C(OCC)(=O)C>[CH3:37][CH:38]1[CH2:43][CH2:42][N:41]([C:28]([CH:27]2[CH2:26][S:25][CH:24]([C:31]3[CH:32]=[N:33][CH:34]=[CH:35][CH:36]=3)[N:23]2[C:21]([O:20][C:16]([CH3:17])([CH3:18])[CH3:19])=[O:22])=[O:30])[CH2:40][CH2:39]1

Participants

7

Reactant 4

HCID 10868DicyclohexylcarbodiimideHCID 693814-MethylpiperidineHCID 757711-HydroxybenzotriazoleHCID 14772789N-tert-butoxycarbonyl-2-(3-pyridyl)thiazolidine-4-carboxylic acid

Product 1

HCID 20074083HCID 20074083, compound

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8857Ethyl AcetateSolvent

Procedure

A solution of 540 mg of dicyclohexylcarbodiimide in 5 ml of tetrahydrofuran was added dropwise to a mixture of 810 mg of N-tert-butoxycarbonyl-2-(3-pyridyl)thiazolidine-4-carboxylic acid, 260 mg of 4-methylpiperidine, 530 mg of 1-hydroxybenzotriazole and 10 ml of tetrahydrofuran with ice cooling, and the mixture was stirred with ice cooling for 1 hour and then at room temperature for 12 hours. The reaction mixture was diluted with 30 ml of ethyl acetate, and the insoluble matter was filtered off. The filtrate was washed in sequence with saturated aqueous solution of sodium hydrogen carbonate and saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate and concentrated under reduced pressure to give 4-methyl-1-[3-tert-butoxycarbonyl-2-(3-pyridyl)thiazolidin-4-ylcarbonyl]piperidine. Trifluoroacetic acid (5 ml) was added to the thus-obtained compound, and the mixture was stirred at room temperature for 1 hour. The reaction mixture was concentrated under reduced pressure, the residue was dissolved in ethyl acetate, and the solution was washed in sequence with saturated aqueous solution of sodium hydrogen carbonate and saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate and concentrated under reduced pressure The residue thus obtained was purified by silica gel column chromatography (eluent: ethyl acetate) to give 4-methyl-1-[2-(3-pyridyl)thiazolidin-4-ylcarbonyl]piperidine. This compound was dissolved in ethyl acetate, and 3 ml of 2N hydrogen chloride solution in dioxane was added The resultant solid was collected by filtration, washed with ethyl acetate and dried to give 530 mg of 4-methyl-1-(3-pyridyl)thiazolidin-3-ylcarbonyl]piperidine dihydrochloride. Melting point 130° C.

Workup

  1. waitat room temperature for 12 hours
  2. filtrationthe insoluble matter was filtered off
  3. washThe filtrate was washed in sequence with saturated aqueous solution of sodium hydrogen carbonate and saturated aqueous solution of sodium chloride
  4. dry with materialdried over anhydrous sodium sulfate
  5. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-686d181fcfb4408198031984eb1753ec
Source dataset
uspto-grants-1991_01
Patent number
US04987132

Reaction notes

Loading…