Zinc → HCID 87229536, compound

Dimethylbiguanide (66 mg) was dissolved in 1 mL of anhydrous DMSO, after which 0.88 mL of 1 M potassium t-butoxide in t-butanol was added and the solution stirred for 10 minutes. Zinc chloride in diethyl ether (0.22 mL of 1M solution) was added and the solution stirred for 3 hours. The solution was concentrated in vacuo at 35° C., after which 0.5 mL of ethanol was added and the mixture triturated and transferred to a 2 mL microcentrifuge tube. The product was separated from the liquid by centrifuging at 8,000 rpm for 6 minutes and the supernatant was decanted. The pellet was washed by adding 0.5 mL of ethanol, vortex mixed, centrifuged and the supernatant decanted. The washing procedure was repeated. After an overnight drying under high vacuum the yield was 57 mg of a free flowing white powder. 1H NMR (DMSO): δ 4.90 (s), 4.66 (s), 4.50 (s), 2.80 (s). The large upfield shifts of —NH protons relative to dimethylbiguanide indicate complexation with zinc. A small upfield shift of 0.05 ppm in the dimethyl groups was also observed in the dimethylbiguanide-zinc complex. FIGS. 14 and 15 show the NMR spectra of dimethylbiguanide-zinc and dimethylbiguanide, respectively. The product was further characterized by ICP. Zinc analysis (ICP): Found 8.14%. FTIR data did not indicate presence of a DMSO ligand. NMR and ICP data clearly indicate the formation of a dimethylbiguanide-zinc complex. FIG. 28 represents the biguanide-metal complex prepared. MALDI-ES analysis did not reveal a zinc containing compound.

1. stirringthe solution stirred for 3 hours
2. concentrationThe solution was concentrated in vacuo at 35° C.
3. additionafter which 0.5 mL of ethanol was added
4. customthe mixture triturated
5. customtransferred to a 2 mL microcentrifuge tube
6. customThe product was separated from the liquid by centrifuging at 8,000 rpm for 6 minutes
7. customthe supernatant was decanted
8. washThe pellet was washed
9. additionby adding 0.5 mL of ethanol, vortex
10. additionmixed
11. customAfter an overnight drying under high vacuum the yield was 57 mg of
12. customprepared

ORD record

ord-b7d0f72ebf4a4e4b85e7b5106d5630ee

Source dataset

uspto-grants-2011_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07989440B2