Hydrochloric Acid → (2'-(1H-Tetrazol-5-yl)biphenyl-4-yl)methanol

Temperatur

100 °C

2.1 g of 4′-hydroxymethyl-biphenyl-2-carbonitrile (10 mmol), are treated, in a drop wise manner at 0° C. with 5.52 ml of triethyl aluminium (10 mmol, 1.8M in toluene). The reaction mixture is stirred for 5 minutes. After that, the clear colourless reaction mixture is added to the solution of diisobutyl aluminium azide (19 mmol), gradually warmed to an internal temperature of about 100° C. and stirred over the night (conversion 95.7%). For the work up the reaction mixture is cooled to 0° C. and added dropwise to a solution of 30 ml of HCl (2 N) containing 1.38 g of NaNO2 (20 mmol) (cooled to 0° C.). 40 ml of iso-propyl acetate are added and the mixture is extracted once with 15 ml of HCl 2N, once with 20 ml of water. The combining aqueous layers are extracted twice with 10 ml of isopropyl acetate. The organic phase is extracted three times with 15 ml portions of an aqueous solution of K2CO3 (10%). The aqueous phase is washed once with 15 ml of isopropyl acetate. HCl (2 N) is added to the aqueous phase to adjust the pH to 2, and the solution is extracted three times with 20 ml portion of isopropyl acetate. The combining organic phase is washed once with 20 ml of water and the solvent is removed to give the crude product. The crude product is crystallized from ethyl acetate and isopropyl ether to give the pure product.

1. stirringstirred over the night (conversion 95.7%)
2. temperatureFor the work up the reaction mixture is cooled to 0° C.
3. extractionthe mixture is extracted once with 15 ml of HCl 2N, once with 20 ml of water
4. extractionThe combining aqueous layers are extracted twice with 10 ml of isopropyl acetate
5. extractionThe organic phase is extracted three times with 15 ml portions of an aqueous solution of K2CO3 (10%)
6. washThe aqueous phase is washed once with 15 ml of isopropyl acetate. HCl (2 N)
7. additionis added to the aqueous phase
8. extractionthe solution is extracted three times with 20 ml portion of isopropyl acetate
9. washThe combining organic phase is washed once with 20 ml of water
10. customthe solvent is removed

ORD-Eintrag

ord-c711e2894ffd4f1789c7e0a32bfb8e61

Quelldatensatz

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08569528B2