Trifluoromethanesulfonic acid → HCID 178502735, compound

HRID 2389194Notes

Reaction equation

HRID 2389194 reaction equation
[OH:1][C@@H:2]1[CH2:7][CH2:6][C@H:5]([C:8]([N:10]([O:12][CH3:13])[CH3:11])=[O:9])[CH2:4][CH2:3]1.[CH2:14](OC(=N)C(Cl)(Cl)Cl)[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.FC(F)(F)S(O)(=O)=O>C1CCCCC1.C(Cl)Cl>[CH2:14]([O:1][C@@H:2]1[CH2:7][CH2:6][C@H:5]([C:8]([N:10]([O:12][CH3:13])[CH3:11])=[O:9])[CH2:4][CH2:3]1)[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1

Participants

5

Reactant 3

HCID 62406Trifluoromethanesulfonic acidHCID 144968Benzyl 2,2,2-trichloroacetimidateHCID 178502733HCID 178502733, compound

Product 1

HCID 178502735HCID 178502735, compoundYield 96.4%

Reagents, catalysts & solvents 1

HCID 21916607Dichloromethane cyclohexaneSolvent

Procedure

To a mixture of cis-4-hydroxy-N-methoxy-N-methylcyclohexanecarboxamide (3.556 g, 0.0190 mol) and benzyl-2,2,2-trichloroacetimidate (4.0 mL, 0.021 mol, 1.1 eq) in cyclohexane/DCM (20 mL/10 mL) at 0° C. was added trifluoromethanesulfonic acid dropwise with stirring under nitrogen atmosphere over 30 min. There was an immediate precipitate. The mixture was stirred at room temperature for 15 h, filtered, and the filtrate washed with sodium bicarbonate solution and brine. The organic layer was concentrated and purified by silica gel column chromatography using petroleum ether/ethyl acetate (5/1) as eluent to give product as a colorless oil (5.079 g, 77%). 1H NMR (400 MHz, CDCl3) δ 7.38-7.23 (m, 5H), 4.50 (s, 2H), 3.71 (s, 3H), 3.70-3.66 (m, 1H), 3.18 (s, 3H), 2.78-2.62 (m, 1H), 2.07-1.89 (m, 4H), 1.59-1.25 (m, 4H).

Workup

  1. stirringThe mixture was stirred at room temperature for 15 h
  2. filtrationfiltered
  3. washthe filtrate washed with sodium bicarbonate solution and brine
  4. concentrationThe organic layer was concentrated
  5. custompurified by silica gel column chromatography

Sources & evidence

ORD record
ord-45707c90ad0d4ee3a44e221662ffe167
Source dataset
uspto-grants-2012_09
Patent number
US08269043B2

Reaction notes

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