Methanol → 3-Morpholinecarboxylic acid

Temperatur

0 °C

A solution of 4-([4-2-butynyloxy)phenyl]sulfonyl}-morpholine-3-carboxylic acid, methyl ester (0.1 g, 0.28 mmol) in 2.4 mL of THF:methanol:water [4:1:1] was cooled in an ice bath and 2N LiOH (0.3 mL, 0.59 mmol) was added. The reaction was stirred at 0° C. for 30 minutes and at room temperature for 2 hours. After evaporating the solvent, the residue was diluted with ether and filtered. The solid was dissolved in water, neutralized with 1N HCl to pH˜3 and extracted with dichloromethane. The organic layer was washed with water and brine, dried over sodium sulfate, filtered and concentrated to give 0.06 g of 4-[4-(2-butynyloxy)phenyl]sulfonyl}-morpholine-3-carboxylic acid. Yield˜69.8%. mp 40-42° C. Electrospray Mass Spec 338.1(M−H)−.

1. customAfter evaporating the solvent
2. additionthe residue was diluted with ether
3. filtrationfiltered
4. dissolutionThe solid was dissolved in water
5. extractionextracted with dichloromethane
6. washThe organic layer was washed with water and brine
7. dry with materialdried over sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated

ORD-Eintrag

ord-12e6a469b8b9447fb50a8594342c32bc

Quelldatensatz

uspto-grants-2001_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06225311B1