Triethylamine → 1-(2-Azidopropyl)-8-(1-ethoxyethoxy)-1,7,8,9-tetrahydro-pyrano[2,3-g]indazole
Reaction equation
[CH2:1]([O:3][CH:4]([O:6][CH:7]1[CH2:23][O:22][C:10]2=[CH:11][CH:12]=[C:13]3[C:17]([N:16]([CH2:18][CH:19](O)[CH3:20])[N:15]=[CH:14]3)=[C:9]2[CH2:8]1)[CH3:5])[CH3:2].C(N(CC)CC)C.CS(OS(C)(=O)=O)(=O)=O.[N-:40]=[N+:41]=[N-:42].[Na+]>C1COCC1.CS(C)=O>[N:40]([CH:19]([CH3:20])[CH2:18][N:16]1[C:17]2[C:13](=[CH:12][CH:11]=[C:10]3[O:22][CH2:23][CH:7]([O:6][CH:4]([O:3][CH2:1][CH3:2])[CH3:5])[CH2:8][C:9]3=2)[CH:14]=[N:15]1)=[N+:41]=[N-:42]Participants
7
Reactant 4
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 90 °C
Procedure
To solution of the product from Step G (0.52 g, 1.6 mmol) and triethylamine (1.12 mL, 8.1 mmol) in anhydrous THF (75 ml) at 0° C. was added methanesulfonic anhydride (0.71 g, 4.05 mmol). The mixture was stirred for 20 min and sodium azide (2.11 g, 32.4 mmol) was added along with DMSO (20 mL). The THF was removed (in vacuo) and the reaction mixture was heated at 90° C. for 3 h. The mixture was cooled, poured into a saturated solution of sodium bicarbonate (150 mL), and extracted with EtOAc (3×100 mL). The combined extracts were washed with brine (100 mL), dried (MgSO4), and evaporated to a residue that was purified by chromatography (silica, 10% EtOAc/hexane) to give an oil (0.40 g, 72%): LC/MS (+APCI) mz 346 (M+H).
Workup
- customThe THF was removed (in vacuo)
- temperatureThe mixture was cooled
- additionpoured into a saturated solution of sodium bicarbonate (150 mL)
- extractionextracted with EtOAc (3×100 mL)
- washThe combined extracts were washed with brine (100 mL)
- dry with materialdried (MgSO4)
- customevaporated to a residue that
- customwas purified by chromatography (silica, 10% EtOAc/hexane)
Sources & evidence
- ORD record
- ord-bf38218d0445413fbfa1dcf92f60c06a
- Source dataset
- uspto-grants-2005_04
- Patent number
- US06881749B2
Reaction notes
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