5-cyclohexyl-1,3,4-oxadiazol-2-amine synthesis

4synthesis methods

Product Name:5-cyclohexyl-1,3,4-oxadiazol-2-amine
CAS Number:98427-18-0
Molecular formula:C8H13N3O
Molecular Weight:167.21

563-41-7
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2043-61-0 Synthesis

2043-61-0
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98427-18-0
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$46.00/1g

Yield:98427-18-0 60%

Reaction Conditions:

Stage #1: hydrazinecarboxamide monohydrochloride;cyclohexanecarbaldehydewith anhydrous Sodium acetate in tetrahydrofuran;lithium hydroxide monohydrate; for 1.5 h;Cooling with ice;
Stage #2: with chloramine-T;potassium carbonate in tetrahydrofuran;lithium hydroxide monohydrate at 20; for 3 h;

Steps:

C10 Example C10

Example C10
Production of 5-cyclohexyl-1,3,4-oxadiazol-2-amine
A solution of semicarbazide hydrochloride (1.22 g, 10.9 mmol) and sodium acetate (0.897 g, 10.9 mmol) in water (10 mL) was cooled in ice, then cyclohexacarbaldehyde (1.17 g, 10.4 mmol) and tetrahydrofuran (THF) (3.0 mL) were added thereto, and the mixture was stirred. 1.5 hours later, tetrahydrofuran (THF) (27 mL), potassium carbonate (3.60 g, 26.0 mmol), and chloramine T trihydrate (4.11 g, 14.6 mmol) were added to the reaction solution, and the mixture was stirred at room temperature. 3 hours later, the reaction solution was washed with a 2:1 mixed solution of a 20% sodium bisulfite aqueous solution and 30% aqueous sodium chloride solution. 4 mol/L hydrochloric acid in ethyl acetate (7.8 mL, 31.2 mol) and toluene were added to the obtained organic layer, followed by extraction with a 4:1 mixed solution of 2 mol/L hydrochloric acid and 30% aqueous sodium chloride solution.
The obtained aqueous layer was adjusted to pH 12 or higher by the addition of a 10 mol/L sodium hydroxide aqueous solution.
After overnight stirring, the resulting solid was collected by filtration, washed with water, and then dried under reduced pressure to obtain the title compound (1.04 g, yield: 60%) as a white solid.
¹H-NMR (400 MHz, DMSO-D₆) δ: 6.81 (2H, brs), 2.72-2.69 (1H, m), 1.92-1.88 (2H, m), 1.76-1.69 (2H, m), 1.63-1.61 (1H, m), 1.47-1.17 (5H, m)
ESI-MS (m/z): 168 (M+H)⁺

References:

US2022/169640,2022,A1 Location in patent:Paragraph 0287-0289

563-41-7
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7080-50-4 Synthesis