4-(4-TERT-BUTOXYCARBONYLPIPERAZINYL)PHENYLBORONIC ACID, PINACOL ESTER Chemical Properties

Melting point:

157 °C

Boiling point:

501.7±45.0 °C(Predicted)

Density 

1.11

storage temp. 

Keep in dark place,Sealed in dry,Room Temperature

form 

solid

pka

3.06±0.10(Predicted)

color 

Off-white to light yellow

InChIKey

ZMAVVXGWEHZLDW-UHFFFAOYSA-N

Safety Information

Risk Statements 

36/37/38

Safety Statements 

26-36

Hazard Note 

Harmful

HS Code 

2933998090

4-(4-TERT-BUTOXYCARBONYLPIPERAZINYL)PHENYLBORONIC ACID, PINACOL ESTER Usage And Synthesis

Uses

tert-Butyl 4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)piperazine-1-carboxylate (cas# 470478-90-1) is a useful reactant for the preparation of 211At- and 125I-?radiolabeled compounds.

Synthesis

Bis(pinacolato)diboron (2.3 g, 9.37 mmol) and potassium acetate (1.7 g, 17.59 mmol) were sequentially added to a stirred solution of 1-Boc-4-(4-bromophenyl)piperazine (2.0 g, 5.86 mmol) in 1,4-dioxane (40 mL) under argon protection. The reaction mixture was purged with argon for 15 min at room temperature. Subsequently, [1,1'-bis(diphenylphosphino)ferrocene]palladium(II) dichloride (428 mg, 0.58 mmol) was added and the reaction mixture was transferred to a sealed tube and the reaction was stirred for 6 hours at 110 °C. The reaction progress was monitored by thin layer chromatography (TLC). Upon completion of the reaction, the reaction mixture was diluted with water (50 mL) and extracted with ethyl acetate (2 x 50 mL). The organic phases were combined and washed sequentially with water (50 mL) and saturated saline (50 mL). The organic layer was dried with anhydrous sodium sulfate and concentrated under reduced pressure to afford the target product 4-[4-(N-BOC)piperazin-1-yl]phenylboronic acid pinacol ester (2.0 g, 5.15 mmol, 87% yield) as a white solid. NMR hydrogen spectrum (500 MHz, CDCl3): δ 7.7 (d, J=2.6 Hz, 1H), 6.90 (d, J=8.7 Hz, 2H), 3.6 (m, 4H), 3.2-3.3 (m, 4H).

References

[1] Patent: WO2017/117393, 2017, A1. Location in patent: Page/Page column 205; 206
[2] Patent: US2018/179183, 2018, A1. Location in patent: Paragraph 1274
[3] European Journal of Organic Chemistry, 2017, vol. 2017, # 3, p. 453 - 458
[4] Journal of Medicinal Chemistry, 2012, vol. 55, # 11, p. 5361 - 5379
[5] Patent: US2012/184520, 2012, A1. Location in patent: Page/Page column 18

4-(4-TERT-BUTOXYCARBONYLPIPERAZINYL)PHENYLBORONIC ACID, PINACOL ESTER(470478-90-1)Related Product Information

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• 2-(4-TERT-BUTOXYCARBONYLPIPERAZINYL)PHENYLBORONIC ACID, PINACOL ESTER
• 3-(4-TERT-BUTOXYCARBONYLPIPERAZINYL)PHENYLBORONIC ACID, PINACOL ESTER
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• 4-(4-TERT-BUTOXYCARBONYLPIPERAZINYL)PHENYLBORONIC ACID, PINACOL ESTER
• 1-[4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-piperazine
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• 1-METHYL-4-[4-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)PHENYL]PIPERAZINE
• [4-(Piperazin-1-yl)phenyl]boronic acid
• 4-(N-METHYLAMINO)PHENYLBORONIC ACID, PINACOL ESTER
• (4-[4-(TERT-BUTOXYCARBONYL)PIPERAZIN-1-YL]PHENYL)BORONIC ACID
• N,N-Diethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline
• 4-(N,N-DIMETHYLAMINO)PHENYLBORONIC ACID, PINACOL ESTER