[CH2:1]([N:4]1[CH2:9][CH2:8][O:7][CH2:6][CH2:5]1)[CH:2]=[CH2:3].[N+:10]([CH2:13][CH2:14][O:15][CH:16]1[CH2:21][CH2:20][CH2:19][CH2:18][O:17]1)([O-])=[O:11].C1(N=C=O)C=CC=CC=1.C(N(CC)CC)C>C1(C)C=CC=CC=1>[O:17]1[CH2:18][CH2:19][CH2:20][CH2:21][CH:16]1[O:15][CH2:14][C:13]1[CH2:3][CH:2]([CH2:1][N:4]2[CH2:9][CH2:8][O:7][CH2:6][CH2:5]2)[O:11][N:10]=1
To a solution of N-allylmorpholine (0.76 g, 5.0 mmol) in toluene (10 mL) was added 2-(2-nitroethoxy)tetrahydropyran (1.34 g, 7.7 mmol), phenylisocyanate (2:43 g, 20.1 mmol), and triethylamine (52 mg; 0.5 mmol). The resulting mixture was heated at 55° C. overnight. After cooling to room temperature the formed precipitate was removed by filtration and the remaining solution concentrated in vacuo. The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH/NH4OH 96/3.75/0.25) to yield 0.63 g (44%) of [5-((morpholin-4-yl)methyl)-4,5-dihydro-isoxazol-3-yl]methyl 2-tetrahydropyranyl ether. MH+ 285, Rf 0.34 (CH2Cl2/MeOH/NH4OH 96/3.75/0.25).
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