Acetic Acid → HCID 136385253, compound

HRID 907856Notes

Reaction equation

HRID 907856 reaction equation
[O:1]=[C:2]1[C:11]2[CH:10]=[CH:9][CH:8]=[C:7]3[NH:12][CH:13]([C:21]4[CH:28]=[CH:27][C:24]([CH:25]=O)=[CH:23][CH:22]=4)[CH:14]([C:15]4[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=4)[C:5]([C:6]=23)=[N:4][NH:3]1.C(O)(=O)C.[CH2:33]([N:35]1[CH2:40][CH2:39][NH:38][CH2:37][CH2:36]1)[CH3:34].[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>ClCCl>[CH2:33]([N:35]1[CH2:40][CH2:39][N:38]([CH2:25][C:24]2[CH:23]=[CH:22][C:21]([CH:13]3[NH:12][C:7]4[C:6]5[C:5](=[N:4][NH:3][C:2](=[O:1])[C:11]=5[CH:10]=[CH:9][CH:8]=4)[CH:14]3[C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=3)=[CH:28][CH:27]=2)[CH2:37][CH2:36]1)[CH3:34]

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 791961-EthylpiperazineHCID 5049666Sodium triacetoxyborohydrideHCID 136344752HCID 136344752, compound

Product 1

HCID 136385253HCID 136385253, compoundYield 53.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of 4-(3-oxo-9-phenyl-3,7,8,9-tetrahydro-2H-pyrido[4,3,2-de]phthalazin-8-yl)benzaldehyde (200 mg, 0.54 mmol) in dichloromethane (30 mL) was added acetic acid (1 mL) followed by the addition of 1-ethylpiperazine (121 mg, 1.63 mmol). After the addition, the mixture was stirred at room temperature overnight. Then the mixture was cooled to 0° C. NaBH(OAc)3 (173 mg, 0.81 mmol) was added. After the addition, the mixture was stirred at this temperature for 12 hr. dichloromethane was removed under reduced pressure. The residue was washed with ethyl acetate/methanol (10/1) and filtered. The filtrate was concentrated to give the crude product. The crude product was purified by prep-HPLC to give 8-(4-((4-ethylpiperazin-1-yl)methyl)phenyl)-9-phenyl-8,9-dihydro-2H-pyrido[4,3,2-de]phthalazin-3(7H)-one (135 mg, yield 47%) as white solid. 1H-NMR (400 MHz, DMSO-d6) δ (ppm): 1.22 (t, 3H), 2.36-2.44 (m, 1H), 2.74-3.11 (m, 8H), 4.01-4.10 (m, 3H), 4.33 (dd, 1H), 4.78 (dd, 1H), 7.13-7.31 (m, 10H), 7.37 (d, 1H), 7.47 (s, 1H), 7.58 (t, 3H); LC-MS (ESI) m/z: 452(M+1)+.

Workup

  1. additionAfter the addition
  2. temperatureThen the mixture was cooled to 0° C
  3. additionAfter the addition
  4. stirringthe mixture was stirred at this temperature for 12 hr
  5. customdichloromethane was removed under reduced pressure
  6. washThe residue was washed with ethyl acetate/methanol (10/1)
  7. filtrationfiltered
  8. concentrationThe filtrate was concentrated
  9. customto give the crude product
  10. customThe crude product was purified by prep-HPLC

Sources & evidence

ORD record
ord-055af49338644c0db637c0dc5865aa52
Source dataset
uspto-grants-2011_09
Patent number
US08012976B2

Reaction notes

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