Formaldehyde → 3,5-Dimethyl-5-nitro-1,3-oxazinane

Beteiligte Stoffe

Reaktionsschritte

To a solution of 2-nitro-2-methyl-1,3-propanediol (20.4 g, 151 mmol) in 40% aqueous methylamine (11.7 g, 151 mmol), was added an aqueous solution of formaldehyde (37% formaldehyde, 12.2 g, 151 mmol). The reaction was stirred at room temperature for one week, then extracted with ether three times. The organic fractions were dried over sodium sulfate and concentrated under reduced pressure to give a crude oil which was purified by column chromatography (50 to 100% ethyl acetate in hexanes) to give the desired product (15.4 g, 96.1 mmol, 63%). 1H NMR (400 MHz, CDCl3) δ 1.45 (s, 3H), 2.32 (s, 3H), 2.63-2.66 (d, J=13.2 Hz, 1H), 3.51-3.54 (d, J=12.6 Hz, 1H), 3.67-3.71 (dt, J=1.9, 13.2 Hz, 1H), 3.86-3.89 (d, J=8.5 Hz, 1H), 4.29-4.32 (dd, J=1.2, 8.6 Hz, 1H), 4.61-4.66 (dd, J=2.4, 12.6 Hz, 1H). 13C NMR (100 MHz, CDCl3) δ 22.0, 39.9, 59.8, 71.2, 83.1, 86.1. LRMS (ESI/APCI) m/z 161 [M+H]+.

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