Triethylamine → HCID 88536713, compound

Participants

Reaction Steps

A solution of tert-butyl 6-methylene-1,4-oxazepane-4-carboxylate 38.2 (1.23 g, 5.74 mmol) in 1,4-dioxane (20 mL) and H2O (20 mL) was treated with sodium periodate (2.46 g, 11.49 mmol) and a solution of 2.5% OsO4 in t-BuOH (0.36 mL, 0.028 mmol). The reaction mixture was stirred at room temperature for 18 hrs. The resulting yellow-white suspension was diluted with H2O and extracted with EtOAc (2×50 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo to provide a brown oil (1.30 g) that was used immediately without further purification. The crude tert-Butyl 6-oxo-1,4-oxazepane-4-carboxylate (4.4 g, 20.4 mmol) was dissolved in THF (100 mL) and treated with Et3N (11.4 mL, 81.8 mmol) and hydroxylamine hydrochloride (3.1 g, 45.0 mmol). The mixture was stirred at room temperature over the weekend. The mixture was concentrated in vacuo to dryness and the residue was suspended between EtOAc and water. The aqueous layer was extracted with EtOAc. The organics were washed with brine, dried over MgSO4, filtered and concentrated in vacuo to yield (4.8 g) of a semisolid product 38.3. LCMS m/z=253.1 [M+Na], 461.3 [2M] with two equal peaks observed (oxyme stereoisomers presumably). Used without further purification.

Provenance & Evidence