Dimethylformamide dimethyl acetal → HCID 13281184, compound

HRID 1388371Notes

Reaction equation

HRID 1388371 reaction equation
[N:1]1([CH2:6][CH2:7][CH:8]2[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]2)[CH:5]=[CH:4][N:3]=[CH:2]1.[CH3:14][O:15][CH:16]([O:20][CH3:21])N(C)C>>[CH3:14][O:15][CH:16]([O:20][CH3:21])[N:11]1[CH2:12][CH2:13][CH:8]([CH2:7][CH2:6][N:1]2[CH:5]=[CH:4][N:3]=[CH:2]2)[CH2:9][CH2:10]1

Participants

3

Reactant 2

HCID 78373Dimethylformamide dimethyl acetalHCID 132811834-[2-(1H-Imidazol-1-yl)ethyl]piperidine

Product 1

HCID 13281184HCID 13281184, compoundYield 87%

Procedure

The free base 4[2-(imidazol-1-yl)ethyl]piperidine (5.1 g, 28.7 mM) and dimethylformamide dimethyl acetal (23 ml) was heated at 100° C. for 6 hours. Removal of the excess of dimethylformamide dimethyl acetal gave 4-[2-(imidazol-1-yl)ethyl]-1-piperidine carboxaldehyde dimethylacetal (6.32 g, 87%) which was dissolved in CH2Cl2 (27 ml) and added to the mixture of 6-aminopenicillanic acid (5.6 g, 258 mM) and diisopropylethylamine (3.41 ml) in CH2Cl2 (100 ml) at 0° C. The reaction was stirred at 0° C. for 1 hr. and room temperature for 3 hrs. The solvent was then removed and water (100 ml) was added. After being washed with ethylacetate, the aqueous solution, acidified to pH 3, was purified on Sephadex LH 20 columns to give [2S-(2alpha,5alpha,6-beta)]-6-[[[4 -[2-(1H-imidazol-1-yl)ethyl]-1-piperidinyl]methylene]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid hydrate hydrochloride (1.8 g, 16% yield).

Workup

  1. customRemoval of the excess of dimethylformamide dimethyl acetal

Sources & evidence

ORD record
ord-42d029bbb00c455cbddab238ced07a32
Source dataset
uspto-grants-1984_02
Patent number
US04431653

Reaction notes

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