5-AMINO-2-METHYLPHENYLBORONIC ACID, PINACOL ESTER Chemical Properties

Melting point:

82-86°C

Boiling point:

366.2±35.0 °C(Predicted)

Density 

1.03

storage temp. 

under inert gas (nitrogen or Argon) at 2–8 °C

form 

solid

pka

5.01±0.10(Predicted)

Appearance

White to off-white Solid

InChI

InChI=1S/C13H20BNO2/c1-9-6-7-10(15)8-11(9)14-16-12(2,3)13(4,5)17-14/h6-8H,15H2,1-5H3

InChIKey

HPNBWHDRLCVZFV-UHFFFAOYSA-N

SMILES

C1(N)=CC=C(C)C(B2OC(C)(C)C(C)(C)O2)=C1

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38-38-36

Safety Statements 

26-36/37/39

WGK Germany 

2

HS Code 

2931900090

5-AMINO-2-METHYLPHENYLBORONIC ACID, PINACOL ESTER Usage And Synthesis

Synthesis

Using 3-iodo-4-methylaniline (1.97 g, 8.45 mmol) and pinacol ester of bis(diphenylphosphino)borate (2.32 g, 9.13 mmol) as raw materials, pinacol ester of bis(boronic acid) was dissolved in DMSO (23 mL) under the protection of argon gas, and potassium acetate (2.87 g, 29.2 mmol) and [1,1'-bis(diphenylphosphino)ferrocene]palladium dichloride were added sequentially ( 345 mg, 0.423 mmol). The reaction mixture was stirred at 80 °C for 4 hours. After completion of the reaction, ethyl acetate and water were added to the mixture, the insoluble material was removed by filtration through diatomaceous earth and the organic phase was extracted with ethyl acetate. The organic layer was washed sequentially with water and brine and dried over anhydrous magnesium sulfate. The solvent was removed by concentration under reduced pressure and the residue was purified by silica gel column chromatography (eluent: ethyl acetate/hexane=6/1) to afford the target product 4-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (Compound A4, 1.36 g, 69% yield). The product was characterized by 1H NMR (300 MHz, CDCl3): δ 1.33 (s, 12H), 2.42 (s, 3H), 3.51 (br s, 2H), 6.68 (dd, J = 8.1,2.7Hz, 1H), 6.97 (d, J = 8.1Hz, 1H), 7.11 (d, J = 2.7Hz, 1H).

References

[1] Patent: EP2269993, 2011, A1. Location in patent: Page/Page column 52
[2] Journal of Medicinal Chemistry, 2006, vol. 49, # 19, p. 5671 - 5686
[3] Patent: US2010/197688, 2010, A1. Location in patent: Page/Page column 16
[4] Patent: WO2015/24905, 2015, A1. Location in patent: Paragraph 00216-00217; 00344-00346
[5] Patent: US2015/80391, 2015, A1. Location in patent: Paragraph 0439; 0440; 0441; 0655; 0656; 0657

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