tert-Butyl 2-aminobenzoate

tert-Butyl 2-aminobenzoate Property

Melting point:

30°C

Boiling point:

284.1±13.0 °C(Predicted)

Density 

1.06 g/mL at 20 °C (lit.)

refractive index 

n20/D 1.540

storage temp. 

2-8°C

solubility 

Chloroform (Slightly), Ethyl Acetate (Slightly)

form 

Solid

pka

2.17±0.10(Predicted)

color 

Pale Brown to Light Brown

BRN 

2936796

Safety

Hazard Codes 

Xi

Risk Statements 

36/38-43

Safety Statements 

26-36-36/37

WGK Germany 

3

F 

10-21

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H317May cause an allergic skin reaction

Precautionary statements

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

P272Contaminated work clothing should not be allowed out of the workplace.

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

P302+P352IF ON SKIN: wash with plenty of soap and water.

P333+P313IF SKIN irritation or rash occurs: Get medical advice/attention.

tert-Butyl 2-aminobenzoate Chemical Properties,Usage,Production

Uses

tert-Butyl 2-Aminobenzoate is a useful reagent for preparing alkylamino quinazolinones.

Synthesis Reference(s)

The Journal of Organic Chemistry, 43, p. 447, 1978 DOI: 10.1021/jo00397a015

reaction suitability

reaction type: solution phase peptide synthesis

Synthesis

The general procedure for the synthesis of tert-butyl 2-aminobenzoate from tert-butyl 2-nitrobenzoate was as follows: tert-butyl 2-nitrobenzoate (194.8 g, 0.873 mol) was dissolved in ethanol (2.5 L) in a 5 L Parr reactor, and Raney's nickel catalyst (72 g), which had been washed five times with ethanol, was added. The reaction system was degassed three times (evacuated and then filled with nitrogen). Subsequently, the system was pressurized with hydrogen (initial pressure 30 psi) and the hydrogen pressure was increased to 50 psi after 1.5 h. The reaction mixture was stirred overnight, during which time the system pressure was reduced to 30 psi and then pressurized again to 50 psi. Upon completion of the reaction (about one day), the mixture was filtered through diatomaceous earth, and the filtrate was concentrated by evaporation to afford the brown oily product tert-butyl 2-aminobenzoate (160.8 g, 95% yield). The product was characterized by 1H NMR (300 MHz, CDCl3): δ 7.82 (dd, 1H), 7.22 (ddd, 1H), 6.55-6.65 (m, 2H), 5.7 (br s, 1H), 1.58 (s, 9H).

References

[1] Bioorganic and Medicinal Chemistry Letters, 2007, vol. 17, # 8, p. 2347 - 2350
[2] Patent: WO2004/18428, 2004, A1. Location in patent: Page 367
[3] Journal of Medicinal Chemistry, 2008, vol. 51, # 24, p. 7751 - 7767
[4] Journal of Organic Chemistry, 2013, vol. 78, # 18, p. 8966 - 8979
[5] Patent: WO2008/122667, 2008, A2. Location in patent: Page/Page column 53