tert-Butyl piperazine-1-carboxylate → tert-butyl 4-(7-acetoxy-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate

HRID 2200259Notes

Reaction equation

HRID 2200259 reaction equation
[C:1]([O:4][CH:5]1[C:9]2[N:10]=[CH:11][N:12]=[C:13](Cl)[C:8]=2[CH2:7][CH2:6]1)(=[O:3])[CH3:2].[C:15]([N:22]1[CH2:27][CH2:26][NH:25][CH2:24][CH2:23]1)([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16]>CN1C(=O)CCC1.C(OCC)(=O)C>[C:1]([O:4][CH:5]1[C:9]2[N:10]=[CH:11][N:12]=[C:13]([N:25]3[CH2:24][CH2:23][N:22]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:27][CH2:26]3)[C:8]=2[CH2:7][CH2:6]1)(=[O:3])[CH3:2]

Participants

5

Reactant 2

HCID 143452tert-Butyl piperazine-1-carboxylateHCID 199689354-chloro-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-yl acetate

Product 1

HCID 59671081tert-butyl 4-(7-acetoxy-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylateYield 75.1%

Reagents, catalysts & solvents 2

HCID 8857Ethyl AcetateSolventHCID 13387N-methyl-2-pyrrolidoneSolvent

Procedure

To a solution of 4-chloro-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-yl acetate (1.15 g, 5.4 mmol) in NMP (4 mL) and TEA (0.5 mL) was added 1-Boc-piperazine (1.05 g, 5.64 mmol). The mixture was microwaved at 100° C. for 30 minutes and then diluted with ethyl acetate (200 mL) and washed with water (6×100 mL). The organic phase was dried and concentrated. The residue was subject to chromatography on silica gel, eluting by hexanes/ethyl acetate (2:1-1:1) to afford the tert-butyl 4-(7-acetoxy-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (1.47 g, 75%). 1H NMR (CDCl3, 400 MHz) δ 8.56 (s, 1H), 5.99-5.96 (m, 1H), 3.78-3.73 (m, 2H), 3.53-3.50 (m, 2H), 3.15-3.07 (m, 1H), 2.99-2.92 (m, 1H), 2.63-2.54 (m, 1H), 2.04-1.93 (m, 1H), 1.48 (s, 9H). MS (APCI+) [M+H] +363.

Workup

  1. customThe mixture was microwaved at 100° C. for 30 minutes
  2. washwashed with water (6×100 mL)
  3. customThe organic phase was dried
  4. concentrationconcentrated
  5. washeluting by hexanes/ethyl acetate (2:1-1:1)

Sources & evidence

ORD record
ord-a4ef059963044f168e25f474559733b3
Source dataset
uspto-grants-2016_06
Patent number
US09359340B2

Reaction notes

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