2,2-Dimethoxypropane → N-(2,2-Dimethyl-1,3-dioxan-5-yl)-6-methoxy-3-nitropyridin-2-amine

HRID 1943189Notes

Reaction equation

HRID 1943189 reaction equation
[CH3:1][O:2][C:3]1[N:8]=[C:7]([NH:9][CH:10]([CH2:13][OH:14])[CH2:11][OH:12])[C:6]([N+:15]([O-:17])=[O:16])=[CH:5][CH:4]=1.C(=O)([O-])O.[Na+].CO[C:25](OC)([CH3:27])[CH3:26]>ClCCl.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>[CH3:26][C:25]1([CH3:27])[O:12][CH2:11][CH:10]([NH:9][C:7]2[C:6]([N+:15]([O-:17])=[O:16])=[CH:5][CH:4]=[C:3]([O:2][CH3:1])[N:8]=2)[CH2:13][O:14]1

Participants

6

Reactant 3

HCID 64952,2-DimethoxypropaneHCID 516892Sodium Bicarbonate2×HCID 221417081,3-Propanediol, 2-[(6-methoxy-3-nitro-2-pyridinyl)amino]-

Product 1

HCID 58001746N-(2,2-Dimethyl-1,3-dioxan-5-yl)-6-methoxy-3-nitropyridin-2-amineYield 92%

Reagents, catalysts & solvents 2

HCID 521998p-Toluenesulfonic acid monohydrateCatalystHCID 6344DichloromethaneSolvent

Procedure

2-{[6-(Methyloxy)-3-nitro-2-pyridinyl]amino}-1,3-propanediol (53.93 g, 228.7 mmol) was stirred in 2,2-dimethoxypropane (900 ml) under argon and p-toluenesulphonic acid monohydrate (1.00 g) was added. The mixture was stirred at room temperature overnight. This was diluted with dichloromethane (1 L) and the resulting solution was treated with saturated aqueous sodium hydrogen carbonate (20 ml) and solid sodium hydrogen carbonate (20 g) with vigorous stirring (effervescence). The mixture was vigorously stirred for 20 minutes, then the remaining water was absorbed by addition of anhydrous sodium sulphate. The mixture was filtered with suction and the solids were washed with DCM (500 ml). The combined filtrate plus washings were evaporated under reduced pressure to give a yellow solid which was stirred with petroleum ether) (40-60°) over the weekend. The solid was isolated by filtration with suction, washed with petroleum ether) (40-60°) and air-dried to give the title compound as a bright yellow solid 57.83 g, 92%).

Workup

  1. stirringwith vigorous stirring (effervescence)
  2. stirringThe mixture was vigorously stirred for 20 minutes
  3. customthe remaining water was absorbed by addition of anhydrous sodium sulphate
  4. filtrationThe mixture was filtered with suction
  5. washthe solids were washed with DCM (500 ml)
  6. customThe combined filtrate plus washings were evaporated under reduced pressure
  7. customto give a yellow solid which
  8. customThe solid was isolated by filtration with suction
  9. washwashed with petroleum ether) (40-60°)
  10. customair-dried

Sources & evidence

ORD record
ord-4424ba240d014d698b2b0fcebbfce5e6
Source dataset
uspto-grants-2013_03
Patent number
US08389524B2

Reaction notes

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