Diisopropylethylamine → (2S)-1-[(6-Chloro-2-methyl-3-pyridinyl)carbonyl]-2-methyl-4-{[4-(trifluoromethyl)phenyl]sulfonyl}piperazine

HATU (460 mg, 1.21 mmol) was added to a solution of 6-chloro-2-methyl-3-pyridinecarboxylic acid (commercially available, e.g. from Anichem, or may be prepared according to known methods) (173 mg, 1.01 mmol) in DMF (4 ml) and the mixture was treated with DIPEA (0.440 ml, 2.52 mmol). This mixture was stirred for ca. 10 min at ambient temperature. (3S)-3-Methyl-1-{[4-(trifluoromethyl)phenyl]sulfonyl}piperazine (may be prepared as described in Description 2) (371 mg, 1.20 mmol) was then added and stirring was continued for one hour. The reaction mixture was partitioned between DCM and sat aq. NaHCO3 solution (20 ml each). The layers were separated and the aqueous was washed with further DCM (2×20 ml). The combined organic layers were concentrated to leave a dark brown gum. Purification by silica chromatography (Biotage SP4, 25S cartridge), eluting with 12-100% ethyl acetate in isohexane, gave the title compound (456 mg) as a pale yellow gum.

1. custommay be prepared
2. stirringstirring
3. waitwas continued for one hour
4. customThe reaction mixture was partitioned between DCM
5. customThe layers were separated
6. washthe aqueous was washed with further DCM (2×20 ml)
7. concentrationThe combined organic layers were concentrated
8. customto leave a dark brown gum
9. customPurification by silica chromatography (Biotage SP4, 25S cartridge)
10. washeluting with 12-100% ethyl acetate in isohexane

ORD-Eintrag

ord-ad25e20281a840f0bccbcd68cbc89b69

Quelldatensatz

uspto-grants-2012_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08288388B2