2-Cyano-N,N-diethylacetamide

2-Cyano-N,N-diethylacetamide Property

Melting point:

121 °C

Boiling point:

114°C/4mmHg(lit.)

Density 

1.013 g/mL at 25 °C

refractive index 

n20/D1.466

Flash point:

>110℃

storage temp. 

2-8°C

solubility 

Chloroform, Ethyl Acetate, Tetrahydrofuran, Methanol

form 

Oil

pka

4.53±0.10(Predicted)

color 

Light Yellow to Light Brown

InChI

InChI=1S/C7H12N2O/c1-3-9(4-2)7(10)5-6-8/h3-5H2,1-2H3

InChIKey

RYSHIRFTLKZVIH-UHFFFAOYSA-N

SMILES

C(N(CC)CC)(=O)CC#N

CAS DataBase Reference

26391-06-0(CAS DataBase Reference)

Safety

WGK Germany 

3

HazardClass 

IRRITANT

HS Code 

2926907090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P337+P313IF eye irritation persists: Get medical advice/attention.

P501Dispose of contents/container to..…

2-Cyano-N,N-diethylacetamide Chemical Properties,Usage,Production

Chemical Properties

Pale Brown Oil

Uses

N,N-Diethyl-2-cyanoacetoamide can be used:

• To prepare N,N-diethyl 2-cyano-2-fluoro-2-phenylthioacetoamide, which is further used in the synthesis of various cyanofluoroamides.
• In the synthesis of entacapone, a catechol-O-methyltransferase inhibitor by reacting with 3,4-dihydroxy-5-nitrobenzaldehyde.
• As a building block in the synthesis of fluorophores, applicable as endoplasmic reticulum probes.

Definition

ChEBI: N,N-diethylcyanoacetamide is an aliphatic nitrile and a monocarboxylic acid amide.

Synthesis

(i) Preparation of N1,N1-diethyl-2-cyanoacetamide: 30 L of anhydrous tetrahydrofuran (THF) was added to the reactor under nitrogen protection, followed by diethylamine (1.272 kg, 17.39 mol). A 33% hexane solution of lithium n-hexyl was loaded into a dropping funnel. The reactor was cooled to below -30°C. The hexyl lithium solution was slowly added dropwise to the reactor, keeping the temperature of the reaction mixture below -30°C during the dropwise addition. After the dropwise addition was completed, the reaction mixture was continued to be stirred at -30 °C for 1.5 hours. Meanwhile, ethyl cyanoacetate (0.655 kg, 5.79 mol) was dissolved in THF (2 L) and transferred to another dropping funnel. The ethyl cyanoacetate solution was slowly added dropwise to the reaction mixture at a temperature well below -30°C. After completion of the dropwise addition, the reaction mixture was gradually warmed to room temperature and stirring was continued for 30 minutes. Subsequently, ethanol (0.66 L) was slowly added dropwise to the reaction mixture and stirred overnight at room temperature. The solvent was removed by distillation under reduced pressure and the residue was treated with 10% hydrochloric acid (8 L) and extracted twice with dichloromethane (DCM, 2 x 7 L). The DCM layers were combined and washed with water (2 × 5 L). The DCM solution was dried and evaporated to dryness to afford the brown oily product N1,N1-diethyl-2-cyanoacetamide (755.29 g, 97% yield), which could be used in the subsequent steps without further purification.1H-NMR (200 MHz, CDCl3): δ 1.2 ppm (t, 6H, J = 7Hz), 3.4 ppm (q, 4H, J = 7Hz), 3.55ppm (s, 2H).

References

[1] Patent: US2008/103191, 2008, A1. Location in patent: Page/Page column 17
[2] Australian Journal of Chemistry, 1976, vol. 29, p. 1039 - 1050
[3] Synthetic Communications, 1990, vol. 20, # 20, p. 3235 - 3243
[4] Journal of the Korean Chemical Society, 2012, vol. 56, # 4, p. 459 - 463