Methylhydrazine → O-(2,2-dimethyl-1,3-dioxan-5-yl)Hydroxylamine

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Reaction Steps

To a stirring solution of the product of Example 33, Step A, 2-(2,2-dimethyl-[1,3]dioxan-5-yloxy)-isoindole-1,3-dione (1.72 g, 6.20 mmol), in dichloromethane (15 mL) at 0° C. under nitrogen was added methylhydrazine (0.36 mL, 6.82 mmol) and allowed to warm to room temperature. After stirring for 2 hours the reaction mixture was concentrated in vacuo and charged with diethylether. The solids were filtered off and the filtrate was collected and concentrated to afford O-(2,2-dimethyl-[1,3]dioxan-5-yl)-hydroxylamine as a yellow oil (0.97 g, 100%). 1H NMR (400 MHz; DMSO-d6) δ 5.98 (bs, 2 H), 3.84-3.87 (m, 2 H), 3.66-3.68 (m, 2 H), 3.30-3.35 (m, 1 H), 1.29 (s, 3 H), 1.22 (s, 3 H); MS (APCI+)=147.9.

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