Water → ethyl 3-(3-(4-methoxybenzyl)-6,7,8,9-tetrahydro-3H-pyrazolo[3,4-c][2,7]naphthyridine-7-carboxamido)benzoate

HRID 2383443Notes

Reaction equation

HRID 2383443 reaction equation
[CH3:1][O:2][C:3]1[CH:22]=[CH:21][C:6]([CH2:7][N:8]2[C:12]3[N:13]=[CH:14][C:15]4[CH2:16][NH:17][CH2:18][CH2:19][C:20]=4[C:11]=3[CH:10]=[N:9]2)=[CH:5][CH:4]=1.[CH2:23]([O:25][C:26](=[O:36])[C:27]1[CH:32]=[CH:31][CH:30]=[C:29]([N:33]=[C:34]=[O:35])[CH:28]=1)[CH3:24].O>ClCCl>[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]([CH2:7][N:8]2[C:12]3[N:13]=[CH:14][C:15]4[CH2:16][N:17]([C:34]([NH:33][C:29]5[CH:28]=[C:27]([CH:32]=[CH:31][CH:30]=5)[C:26]([O:25][CH2:23][CH3:24])=[O:36])=[O:35])[CH2:18][CH2:19][C:20]=4[C:11]=3[CH:10]=[N:9]2)=[CH:21][CH:22]=1

Participants

5

Reactant 3

HCID 962WaterHCID 589806Ethyl 3-isocyanatobenzoateHCID 594904033-(4-methoxybenzyl)-6,7,8,9-tetrahydro-3H-pyrazolo[3,4-c][2,7]naphthyridine

Product 1

HCID 59490753ethyl 3-(3-(4-methoxybenzyl)-6,7,8,9-tetrahydro-3H-pyrazolo[3,4-c][2,7]naphthyridine-7-carboxamido)benzoateYield 77.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 3-(4-methoxybenzyl)-6,7,8,9-tetrahydro-3H-pyrazolo[3,4-c][2,7]naphthyridine (0.208 g, 0.707 mmol) in anhydrous dichloromethane (10 mL) was added 3-isocyanato-benzoic acid ethyl ester (0.135 g, 0.707 mmol). The reaction was then shaken at room temperature for 30 minutes. On completion of the reaction water (10 mL) was added and the organic layer was separated. The aqueous layer was extracted with dichloromethane (20 mL). The organic extracts were combined, washed with brine (2×20 mL), dried using sodium sulfate, filtered and concentrated under reduced pressure. The crude product was purified using flash column chromatography (SiO2, gradient from 50% EtOAc in hexanes to 66% EtOAc in hexane) to give the pure desired product, ethyl 3-(3-(4-methoxybenzyl)-6,7,8,9-tetrahydro-3H-pyrazolo[3,4-c][2,7]naphthyridine-7-carboxamido)benzoate (0.265 g, 77%) as a white solid. M.p.=>80° C.; 400 MHz 1H NMR (DMSO-d6) δ: 8.97 (s, 1H), 8.41 (s, 1H), 8.2 (s, 1H), 8.14-8.1 (m, 1H), 7.85-7.8 (m, 1H), 7.57-7.53 (m, 1H), 7.39 (t, J=7.6 Hz, 1H), 7.21-7.16 (m, 2H), 6.88-6.82 (m, 2H), 5.59 (s, 2H), 4.81 (s, 2H), 4.31 (q, J=7.2 Hz, 2H), 3.84 (t, J=6 Hz, 2H), 3.69 (s, 3H), 3.15 (t, J=6 Hz, 2H), 1.32 (t, J=7.2 Hz, 3H); LCMS [M+H]: 486.

Workup

  1. additionwas added
  2. customthe organic layer was separated
  3. extractionThe aqueous layer was extracted with dichloromethane (20 mL)
  4. washwashed with brine (2×20 mL)
  5. customdried
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customThe crude product was purified

Sources & evidence

ORD record
ord-d9c19b97175747aea518f05689d1aacf
Source dataset
uspto-grants-2012_09
Patent number
US08263610B2

Reaction notes

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