Ammonia → N'-hydroxy-2-(2-isopropyl-1,3-dioxolan-2-yl)acetimidamide

To a solution of hydroxylamine hydrochloride (6.3 g, 91.7 mmol) in methanol (2.5 mL), liquid ammonia (15.7 mL, 7N in methanol) was added and the suspension stirred for 30 minutes at room temperature. A catalytic amount of 8-hydroxiquinoline was added to the mixture, followed by 2-(2-isopropyl-1,3-dioxolan-2-yl)acetonitrile (3.38 g, 22 mmol) as a solution in methanol (2.5 mL). The mixture was stirred at 70° C. overnight. After cooling to room temperature, the suspension was filtered off and washed with dichloromethane. The solution was concentrated under reduced pressure, and reconcentrated three times from toluene to afford N′-hydroxy-2-(2-isopropyl-1,3-dioxolan-2-yl)acetimidamide (3.9 g, 94%) as a yellow solid, which was used directly in the next step without further purification. 1H NMR (300 MHz, CDCl3) δ 5.01 (bs, 2H), 4.05-3.94 (m, 4H), 2.44 (s, 2H), 2.03-1.94 (m, 1H), 0.95 (d, 6H); LC-MS (ESI) m/z 189 (M+H)+.

1. stirringThe mixture was stirred at 70° C. overnight
2. temperatureAfter cooling to room temperature
3. filtrationthe suspension was filtered off
4. washwashed with dichloromethane
5. concentrationThe solution was concentrated under reduced pressure

ORD record

ord-9a78d2c757364646a44705437e1bad76

Source dataset

uspto-grants-2016_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09320739B2