3,4-dihydro-2H-pyran → HCID 54008977, compound

HRID 2295287Notes

Reaction equation

HRID 2295287 reaction equation
[CH:1]12[CH2:8][CH2:7][CH:4]([CH:5]=[CH:6]1)[C:3](=[N:9][OH:10])[S:2]2.[O:11]1[CH:16]=[CH:15][CH2:14][CH2:13][CH2:12]1.CC1C=CC(S(O)(=O)=O)=CC=1.O.C(=O)(O)[O-].[Na+]>C(Cl)Cl>[O:11]1[CH2:16][CH2:15][CH2:14][CH2:13][CH:12]1[O:10][N:9]=[C:3]1[CH:4]2[CH2:7][CH2:8][CH:1]([CH:6]=[CH:5]2)[S:2]1

Participants

6

Reactant 4

HCID 80803,4-dihydro-2H-pyranHCID 516892Sodium BicarbonateHCID 521998p-Toluenesulfonic acid monohydrateHCID 71415470N-2-Thiabicyclo[2.2.2]oct-5-en-3-ylidenehydroxylamine

Product 1

HCID 54008977HCID 54008977, compoundYield 93.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A solution of 10 g (0.06 m) of 2-thiabicyclo[2.2.2]oct-5-en-3-one oxime, 9 g (0.1 m) of 98% dihydropyran, and a catalytic amount of ptoluenesulfonic acid in 30 ml of methylene chloride was heated under reflux overnight. Sodium bicarbonate was added to neutrality. The residue after removal of solvent was purified by dry column chromatography (silica gel-ethyl acetate:hexane::1:1) to give 14.4 g of yellow solid. Recrystallization from etherhexane yielded 10.1 g of the title compound as a white solid, m. 84°-5° C.

Workup

  1. temperatureunder reflux overnight
  2. customThe residue after removal of solvent
  3. customwas purified
  4. dry with materialby dry column chromatography (silica gel-ethyl acetate:hexane::1:1)

Sources & evidence

ORD record
ord-4ef8cb3388ce4452a3396e5414b3a905
Source dataset
uspto-grants-1984_01
Patent number
US04424213

Reaction notes

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