Tetrahydrofuran → (4-chlorophenyl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-1,2,4-triazol-3-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)thiophen-3-yl)methanol

HRID 2401984Notes

Reaction equation

HRID 2401984 reaction equation
Br[C:2]1[S:6][C:5]([C:7]2[N:11]=[CH:10][N:9]([CH:12]3[CH2:17][CH2:16][CH2:15][CH2:14][O:13]3)[N:8]=2)=[C:4]([CH:18]([C:20]2[CH:25]=[CH:24][C:23]([Cl:26])=[CH:22][CH:21]=2)[OH:19])[CH:3]=1.O1CCCC1.C([Mg]Cl)(C)C.C(O[B:41]1[O:45][C:44]([CH3:47])([CH3:46])[C:43]([CH3:49])([CH3:48])[O:42]1)(C)C>>[Cl:26][C:23]1[CH:24]=[CH:25][C:20]([CH:18]([C:4]2[CH:3]=[C:2]([B:41]3[O:45][C:44]([CH3:47])([CH3:46])[C:43]([CH3:49])([CH3:48])[O:42]3)[S:6][C:5]=2[C:7]2[N:11]=[CH:10][N:9]([CH:12]3[CH2:17][CH2:16][CH2:15][CH2:14][O:13]3)[N:8]=2)[OH:19])=[CH:21][CH:22]=1

Participants

5

Reactant 4

HCID 8028TetrahydrofuranHCID 50177412-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolaneHCID 66749509(5-bromo-2-(1-(tetrahydro-2H-pyran-2-yl)-1H-1,2,4-triazol-3-yl)thiophen-3-yl)(4-chlorophenyl)methanolHCID 178418918HCID 178418918, compound

Product 1

HCID 66749137(4-chlorophenyl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-1,2,4-triazol-3-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)thiophen-3-yl)methanolYield 93%

Procedure

To a mixture of {5-bromo-2-[1-(tetrahydro-2H-pyran-2-yl)-1H-1,2,4-triazol-3-yl]-3-thienyl}(4-chlorophenyl)methanol (5.19 g, 11.4 mmol) in tetrahydrofuran (146.9 mL, 1811 mmol) was added isopropylmagnesium chloride (1M in THF, 34.2 mL, 34.2 mmol) at −40° C. under argon. After addition, the reaction temperature was raised to rt for 15 min. The mixture was then cooled to −78° C. and 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (8.149 mL, 39.94 mmol) was added. After the addition, the mixture was brought to rt. After 1 h, the mixture was heated at 75° C. overnight. The mixture was cooled to rt and quenched with saturated ammonium chloride solution. The mixture was stirred for 10 min then extracted with EtOAc. The organic layer was dried and evaporated in vacuum. The mixture was purified by chromatography to afford (4-chlorophenyl)(2-(1-(tetrahydro-2H-pyran-2-yl)-1H-1,2,4-triazol-3-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)thiophen-3-yl)methanol as a thick oil (5.32 g, 65.0%). LCMS: (FA) ES+ 502.2, 504.1.

Workup

  1. additionAfter addition
  2. temperatureThe mixture was then cooled to −78° C.
  3. additionAfter the addition
  4. customwas brought to rt
  5. temperaturethe mixture was heated at 75° C. overnight
  6. temperatureThe mixture was cooled to rt
  7. customquenched with saturated ammonium chloride solution
  8. extractionthen extracted with EtOAc
  9. customThe organic layer was dried
  10. customevaporated in vacuum
  11. customThe mixture was purified by chromatography

Sources & evidence

ORD record
ord-d4b4d274230f4fc3a6ad03e66a23262f
Source dataset
uspto-grants-2014_08
Patent number
US08796271B2

Reaction notes

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