Diisopropylethylamine → Ethyl 2-(5-bromo-3-(2,4-dimethoxybenzylamino)pyrazin-2-ylamino)acetate

HRID 717128Notes

Reaction equation

HRID 717128 reaction equation
Br[C:2]1[C:3]([NH:9][CH2:10][C:11]([O:13][CH2:14][CH3:15])=[O:12])=[N:4][CH:5]=[C:6]([Br:8])[N:7]=1.[CH3:16][O:17][C:18]1[CH:23]=[C:22]([O:24][CH3:25])[CH:21]=[CH:20][C:19]=1[CH2:26][NH2:27].C(N(CC)C(C)C)(C)C>CS(C)=O>[Br:8][C:6]1[N:7]=[C:2]([NH:27][CH2:26][C:19]2[CH:20]=[CH:21][C:22]([O:24][CH3:25])=[CH:23][C:18]=2[O:17][CH3:16])[C:3]([NH:9][CH2:10][C:11]([O:13][CH2:14][CH3:15])=[O:12])=[N:4][CH:5]=1

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 5972502,4-DimethoxybenzylamineHCID 57550751Ethyl 2-(3,5-dibromopyrazin-2-ylamino)acetate

Product 1

HCID 86696613Ethyl 2-(5-bromo-3-(2,4-dimethoxybenzylamino)pyrazin-2-ylamino)acetateYield 48%

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Conditions

Temperature
150 °C

Procedure

Ethyl 2-(3,5-dibromopyrazin-2-ylamino)acetate (See Example 1.C) (1.06 g, 3.13 mmol), (2,4-dimethoxyphenyl)methanamine (0.601 g, 3.60 mmol), N,N-diisopropylethylamine (1.63 mL, 9.38 mmol) and dimethylsulfoxide (1.6 mL) were combined in a microwave vial with a stirbar and heated in a microwave reactor at 150° C. for 2 h. The resulting mixture was purified using flash chromatography (5-60% ethyl acetate in hexane). Fractions containing the desired product were combined and concentrated nearly to dryness under reduced pressure. Ethyl acetate (2 mL) and hexane (18 mL) was added. The resulting solids were collected by vacuum filtration, washed with hexane and dried under high vacuum to give the desired product (0.636 g, 1.495 mmol, 48% yield) as a light pink solid. 1H NMR (300 MHz, DMSO-d6) δ (ppm) 7.24 (s, 1H), 7.19 (d, J=8.52 Hz, 1H), 7.11 (t, J=5.63 Hz, 1H), 6.84 (t, J=4.81 Hz, 1H), 6.59 (d, J=2.47 Hz, 1H), 6.50 (dd, J=2.20, 8.24 Hz, 1H), 4.37 (d, J=4.67 Hz, 2H), 3.96-4.15 (m, 4H), 3.81 (s, 3H), 3.75 (s, 3H), 1.17 (t, 3H); MS (ESI) m/z 425.3 [M]+, 426.9 [M+2]+.

Workup

  1. customThe resulting mixture was purified
  2. additionFractions containing the desired product
  3. concentrationconcentrated nearly to dryness under reduced pressure
  4. additionEthyl acetate (2 mL) and hexane (18 mL) was added
  5. filtrationThe resulting solids were collected by vacuum filtration
  6. washwashed with hexane
  7. customdried under high vacuum

Sources & evidence

ORD record
ord-17ddea4e36b341c79c3ad2aa0137e83e
Source dataset
uspto-grants-2015_11
Patent number
US09193692B2

Reaction notes

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