tert-Butyl piperazine-1-carboxylate → HCID 67457496, compound

HRID 625032Notes

Reaction equation

HRID 625032 reaction equation
Cl[C:2]1[C:3]2[CH:10]([CH3:11])[S:9][CH2:8][C:4]=2[N:5]=[CH:6][N:7]=1.[C:12]([N:19]1[CH2:24][CH2:23][NH:22][CH2:21][CH2:20]1)([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13]>CN1C(=O)CCC1.C(OCC)(=O)C>[CH3:11][CH:10]1[C:3]2[C:2]([N:22]3[CH2:21][CH2:20][N:19]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH2:24][CH2:23]3)=[N:7][CH:6]=[N:5][C:4]=2[CH2:8][S:9]1

Participants

5

Reactant 2

HCID 143452tert-Butyl piperazine-1-carboxylateHCID 717438984-Chloro-5-methyl-5,7-dihydrothieno[3,4-d]pyrimidine

Product 1

HCID 67457496HCID 67457496, compoundYield 70.8%

Reagents, catalysts & solvents 2

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

Procedure

A solution of 4-chloro-5-methyl-5,7-dihydrothieno[3,4-d]pyrimidine (4 g, 21 mmol) and 1-Boc-piperazine (8.5 g, 46 mmol) in NMP (20 mL) was heated to 120° C. overnight. After cooling, the mixture was diluted with ethyl acetate (500 mL) and washed with water (6×300 mL). The organic phase was dried and concentrated. The residue was purified by silica gel chromatography, eluting with Hexane/ethyl acetate (2:1) to provide tert-butyl 4-(5-methyl-5,7-dihydrothieno[3,4-d]pyrimidin-4-yl)piperazine-1-carboxylate (5 g, 69%). The crude material was purified by chiral separation on chiral HPLC (ODH, 250×20 mm, 100% acetonitrile, 15 mL/min) to give (R)-tert-butyl 4-(5-methyl-5,7-dihydrothieno[3,4-d]pyrimidin-4-yl)piperazine-1-carboxylate (retention time: 4.016 min) and (S)-tert-butyl 4-(5-methyl-5,7-dihydrothieno[3,4-d]pyrimidin-4-yl)piperazine-1-carboxylate (retention time: 4.551 min). 1H NMR (CDCl3, 400 MHz) δ 8.53 (s, 1H), 4.83 (m, 1H), 4.18 (m, 2H), 3.73-3.56 (m, 4H), 3.51-3.43 (m, 4H), 1.50 (m, 9H). MS (APCI+) [M+H]+ 337.

Workup

  1. temperatureAfter cooling
  2. washwashed with water (6×300 mL)
  3. customThe organic phase was dried
  4. concentrationconcentrated
  5. customThe residue was purified by silica gel chromatography
  6. washeluting with Hexane/ethyl acetate (2:1)

Sources & evidence

ORD record
ord-c492327d0c9d48f9a4f2399bc261719b
Source dataset
uspto-grants-2016_04
Patent number
US09303040B2

Reaction notes

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