Sulfamide → (3R,5S)-3,5-dimethylpiperazine-1-sulfonamide

To a solution of (2R,6S)-2,6-dimethylpiperazine (1 g) in dioxane (10 ml) was added sulfamide (0.746 g) and the reaction mixture was then heated at reflux in dioxane for 72 h. The reaction mixture was partitioned between EtOAc (150 ml) and H2O (150 ml) and the aqueous re-extracted with EtOAc (2×150 ml). Organics were collected dried and reduced in vacuo to yield (3R,5S)-3,5-dimethylpiperazine-1-sulfonamide as a white solid (0.29 g). A mixture of (3R,5S)-3,5-dimethylpiperazine-1-sulfonamide (0.29 g), tris(dibenzylideneacetone)dipalladium (0) (50 mg), 2-dicyclohexylphosphino-2′,4′,6′-tri-isopropyl-1,1′-biphenyl (XPHOS) (50 mg), cesium carbonate (0.628 g) and 2-[[6-chloro-2-[[(2,3-difluorophenyl)methyl]thio]-4-pyrimidinyl]oxy]-(2R)-propanoic acid ethyl ester (the product of example 5 step i), 0.5 g) in dioxane (10 mL) was heated at reflux in a microwave at 100° C., 300 W, open vessel with cooling for 30 min. The reaction mixture was then reduced in vacuo and the residue was partitioned between EtOAc (150 ml) and H2O (100 ml). The organics were separated and the aqueous layer was re-extracted with EtOAc (2×150 ml). Organics were combined, dried (MgSO4) and reduced in vacuo to give the subtitle compound as a yellow solid. Yield: 0.940 g

1. temperaturethe reaction mixture was then heated
2. customThe reaction mixture was partitioned between EtOAc (150 ml) and H2O (150 ml)
3. extractionthe aqueous re-extracted with EtOAc (2×150 ml)
4. customOrganics were collected
5. customdried

ORD record

ord-a8bebcdb89724a3d8e5b05184e880f38

Source dataset

uspto-grants-2013_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08410123B2