3,4-dihydro-2H-pyran → HCID 66607810, compound

HRID 1890821Notes

Reaction equation

HRID 1890821 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[NH:12][CH:11]=[N:10][N:9]=2)=[CH:4][C:3]=1[CH3:13].[O:14]1[CH:19]=[CH:18][CH2:17][CH2:16][CH2:15]1>O1CCCC1.C(OCC)(=O)C.CS(O)(=O)=O>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[N:12]([CH:15]3[CH2:16][CH2:17][CH2:18][CH2:19][O:14]3)[CH:11]=[N:10][N:9]=2)=[CH:4][C:3]=1[CH3:13]

Participants

6

Reactant 2

HCID 80803,4-dihydro-2H-pyranHCID 178423521HCID 178423521, compound

Product 1

HCID 66607810HCID 66607810, compoundYield 98%

Reagents, catalysts & solvents 3

HCID 6395Methanesulfonic AcidCatalystHCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent2×

Conditions

Temperature
50 °C

Procedure

3-(4-Bromo-3-methylphenyl)-4H-1,2,4-triazole (2.00 g, 8.40 mmol) was dissolved in tetrahydrofuran (10 mL) at room temperature with stirring under nitrogen. 3,4-Dihydro-2H-pyran (3.80 mL, 42.0 mmol) and methanesulfonic acid (0.027 mL, 0.42 mmol) were added and the resulting mixture heated at 50° C. under a reflux condenser under nitrogen for 20 h. The resulting mixture was cooled to room temperature, diluted with ethyl acetate and washed with saturated aqueous sodium bicarbonate and brine. The organics were dried over magnesium sulfate, filtered and concentrated under reduced pressure. Flash chromatography (10-30-50% ethyl acetate in hexanes) gave the desired product (2.64 g, 8.22 mmol, 98% yield) as a yellow oil. MS (ESI) m/z 322 [M]+, 324 [M+2]+.

Workup

  1. temperatureThe resulting mixture was cooled to room temperature
  2. washwashed with saturated aqueous sodium bicarbonate and brine
  3. dry with materialThe organics were dried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-ccdf2f6dfbd44ecb9973c7e1d4b68394
Source dataset
uspto-grants-2013_08
Patent number
US08507492B2

Reaction notes

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