TERT-BUTYL 6-HYDROXY-3,4-DIHYDROISOQUINOLINE-2(1H)-CARBOXYLATE Chemical Properties

Melting point:

110-111.5 °C

Boiling point:

391.4±42.0 °C(Predicted)

Density 

1.170±0.06 g/cm3(Predicted)

storage temp. 

2-8°C

pka

9.79±0.20(Predicted)

Appearance

White to light brown Solid

Safety Information

HazardClass 

IRRITANT

HS Code 

2933491090

TERT-BUTYL 6-HYDROXY-3,4-DIHYDROISOQUINOLINE-2(1H)-CARBOXYLATE Usage And Synthesis

Uses

tert-Butyl 6-hydroxy-3,4-dihydroisoquinoline-2(1H)-carboxylate is a chemical reagent used in the synthesis of androgen receptor modulators.

Synthesis

The general procedure for the synthesis of N-BOC-6-hydroxy-3,4-dihydroisoquinolines from di-tert-butyl dicarbonate and 1,2,3,4-tetrahydroisoquinolin-6-ol hydrobromide was as follows: 1,2,3,4-tetrahydroisoquinolin-6-ol hydrobromide (1.54 g, 6.4 mmol) was suspended in water, and a solution of tetrahydrofuran was slowly added dropwise with triethylamine (1.42 mg, 14.0 mmol ) and di-tert-butyl dicarbonate (1.67 mg, 7.6 mmol) to a tetrahydrofuran solution. The reaction mixture was stirred at room temperature overnight. Subsequently, the reaction solution was concentrated and the residue was dissolved in ethyl acetate, washed with water and dried over anhydrous sodium sulfate. After removal of the solvent by evaporation under reduced pressure, the residue was purified by fast column chromatography (ethyl acetate: hexane = 1:5) to afford N-BOC-6-hydroxy-3,4-dihydroisoquinoline as a viscous yellow oil (1.58 g, 99%). The product was characterized by 1H NMR (300 MHz, CDCl3) and ESI-MS: 1H NMR (300 MHz, CDCl3) δ 6.92 (s, 1H), 6.71 (s, 1H), 6.70 (s, 1H), 6.31 (s, 1H), 4.48 (s, 2H), 3.60 (t, J=5.7Hz, 2H), 2.75 (t, J=5.7Hz, 2H), 1.49 (s, 9H); ESI-MS m/z 248 (MH-).

References

[1] Bioorganic and Medicinal Chemistry, 2016, vol. 24, # 4, p. 789 - 801
[2] Journal of Medicinal Chemistry, 2005, vol. 48, # 10, p. 3586 - 3604
[3] Patent: WO2010/127212, 2010, A1. Location in patent: Page/Page column 31
[4] Journal of Medicinal Chemistry, 2013, vol. 56, # 8, p. 3414 - 3418
[5] Synthetic Communications, 1995, vol. 25, # 20, p. 3255 - 3261

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