Dimethylformamide → 5-Azido-2-phenyl-1,3-dioxane

HRID 1157092Notes

Reaction equation

HRID 1157092 reaction equation
CC1C=CC(S(O[CH:12]2[CH2:17][O:16][CH:15]([C:18]3[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=3)[O:14][CH2:13]2)(=O)=O)=CC=1.CN(C=O)C.[N-:29]=[N+:30]=[N-:31].[Na+]>O>[N:29]([CH:12]1[CH2:17][O:16][CH:15]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[O:14][CH2:13]1)=[N+:30]=[N-:31]

Participants

5

Reactant 3

HCID 6228DimethylformamideHCID 33557Sodium AzideHCID 30899732-Phenyl-1,3-dioxan-5-yl 4-methylbenzenesulfonate

Product 1

HCID 595110585-Azido-2-phenyl-1,3-dioxaneYield 84.1%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
105 °C

Procedure

To a 1 L round bottom flask was added 2-phenyl-1,3-dioxan-5-yl 4-methylbenzenesulfonate (40 g, 120 mmol) and DMF (500 mL). NaN3 (31.3 g, 478 mmol) was added as a solution in water (150 mL). The reaction was stirred at 105° C. for 2 days. The reaction was then concentrated to dryness. The solid was dissolved in water (700 mL) and extracted into EtOAc (3×500 mL). The combined organic layers were washed with water (5×) and concentrated to dryness to afford an orange solid. The material was then recrystallized from hexanes to afford 20.7 g (84% yield) of 22 as a pale brown solid. 1H NMR (CDCl3, 400 MHz), δ: 3.67 (2H, pseudo t, J=11.59 Hz), 3.78-3.88 (1H, m), 4.36-4.04 (2H, m), 7.36-7.39 (3H, m), 7.45-7.47 (2H, m). Mass Spec (lo-res): Calc'd for C10H11N3O2: 205.09; found: 178.1 (M+H−N2).

Workup

  1. concentrationThe reaction was then concentrated to dryness
  2. dissolutionThe solid was dissolved in water (700 mL)
  3. extractionextracted into EtOAc (3×500 mL)
  4. washThe combined organic layers were washed with water (5×)
  5. concentrationconcentrated to dryness
  6. customto afford an orange solid
  7. customThe material was then recrystallized from hexanes

Sources & evidence

ORD record
ord-42984d8fa432407c955797ddbc44dd0c
Source dataset
uspto-grants-2010_10
Patent number
US07807394B2

Reaction notes

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