Hydrochloric Acid → 4-nitrosomorpholine-3-carboxylic Acid

Temperature

0 °C

To a solution of morpholine-3-carboxylic acid (6.96 g, 52 mmol) in water (20 ml), at 0° C. under nitrogen, was added concentrated hydrochloric acid (4 ml), followed by sodium nitrite (5.0 g, 72 mmol) in small portions. The mixture was stirred at 0° C. for 1 hr, and then concentrated under vacuum at 30 to 35° C. The residue was stirred with 200 ml of acetone and filtered. The filtrate was evaporated and the residue treated with 50 ml of THF and concentrated. The process was repeated with 2×50 ml of THF to give 11.87 g of light yellow foam; MS (ESI) m/z 159.2 (M−H).

1. concentrationconcentrated under vacuum at 30 to 35° C
2. stirringThe residue was stirred with 200 ml of acetone
3. filtrationfiltered
4. customThe filtrate was evaporated
5. additionthe residue treated with 50 ml of THF
6. concentrationconcentrated

ORD record

ord-37952142e3af41fcb5b38fd434ed5219

Source dataset

uspto-grants-2006_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07112582B2