tert-Butyl piperazine-1-carboxylate → tert-butyl 4-[(6-bromo-5-methoxy-3,4-dihydro-1H-isochromen-1-yl)methyl]piperazine-1-carboxylate

HRID 2173286Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2173286
[Br:1][C:2]1[C:3]([O:14][CH3:15])=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH:8]([CH:12]=O)[O:7][CH2:6][CH2:5]2.[C:16]([N:23]1[CH2:28][CH2:27][NH:26][CH2:25][CH2:24]1)([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17].[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>C(Cl)Cl>[Br:1][C:2]1[C:3]([O:14][CH3:15])=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH:8]([CH2:12][N:26]1[CH2:25][CH2:24][N:23]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:28][CH2:27]1)[O:7][CH2:6][CH2:5]2

Komponenten

5

Edukt 3

HCID 143452tert-Butyl piperazine-1-carboxylateHCID 5049666Sodium triacetoxyborohydrideHCID 772312476-bromo-5-methoxy-3,4-dihydro-1H-isochromene-1-carbaldehyde

Produkt 1

HCID 68433391tert-butyl 4-[(6-bromo-5-methoxy-3,4-dihydro-1H-isochromen-1-yl)methyl]piperazine-1-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel2×

Versuchsvorschrift

To a solution of 6-bromo-5-methoxy-3,4-dihydro-1H-isochromene-1-carbaldehyde (230 mg, 0.85 mmol) in 10 mL of DCM was added Boc-piperazine (189 mg, 1.02 mmol) and NaBH(OAc)3 (720 mg, 3.4 mmol), and the mixture was stirred at room temperature overnight. The reaction was diluted with DCM, and washed with brine. The organic layer was dried over anhydrous Na2SO4 and concentrated. The residue was purified by prep-TLC to give tert-butyl 4-[(6-bromo-5-methoxy-3,4-dihydro-1H-isochromen-1-yl)methyl]piperazine-1-carboxylate.

Aufarbeitung

  1. washwashed with brine
  2. dry with materialThe organic layer was dried over anhydrous Na2SO4
  3. concentrationconcentrated
  4. customThe residue was purified by prep-TLC

Quellen und Nachweise

ORD-Eintrag
ord-236ecfce58324480921caf4c5765da9a
Quelldatensatz
uspto-grants-2015_06
Patentnummer
US09056859B2

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