Diisopropylethylamine → 1-Methyl-piperidin-4-yl 4-(4-methylphenyl)piperazine-1-carboxylate

To a solution of 1-methylpiperidin-4-yl 4-nitrophenyl carbonate (1.81 g, 6.44 mmol) and DIPEA (0.76 mL, 4.4 mmol) in DMF (20 mL) was added 4-(4-methylphenyl)piperazine (1.53 g, 6.14 mmol). The reaction mixture was stirred at room temperature for 3 hours, the reaction mixture was then concentrated in vacuo. The resulting residue was dissolved in EtOAc (250 mL) and washed with 1M aq Na2CO3 (5×150 mL), dried (MgSO4) and concentrated in vacuo. The residue was purified by normal phase column chromatography (eluting with DCM, followed by a 90:10 mixture of DCM:MeOH) to give 1-methyl-piperidin-4-yl 4-(4-methylphenyl)piperazine-1-carboxylate (1.54 g, 79%) as a cream solid.

1. concentrationthe reaction mixture was then concentrated in vacuo
2. dissolutionThe resulting residue was dissolved in EtOAc (250 mL)
3. washwashed with 1M aq Na2CO3 (5×150 mL)
4. dry with materialdried (MgSO4)
5. concentrationconcentrated in vacuo
6. customThe residue was purified by normal phase column chromatography (
7. washeluting with DCM
8. additionfollowed by a 90:10 mixture of DCM

ORD-Eintrag

ord-7b3836f3188a4e4392c0feed6ad21392

Quelldatensatz

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08093248B2