Diisopropylethylamine → Methyl 3-[5-bromo-3-{[(1R,2R)-3-hydroxy-2-methyl-1-phenylpropyl]amino}-2-oxopyrazin-1(2H)-yl]-5-fluoro-4-methylbenzoate

HRID 1697421Notes

Reaction equation

HRID 1697421 reaction equation
Br[C:2]1[C:3](=[O:21])[N:4]([C:9]2[CH:10]=[C:11]([CH:16]=[C:17]([F:20])[C:18]=2[CH3:19])[C:12]([O:14][CH3:15])=[O:13])[CH:5]=[C:6]([Br:8])[N:7]=1.[NH2:22][C@@H:23]([C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1)[C@@H:24]([CH3:27])[CH2:25][OH:26].CCN(C(C)C)C(C)C>C1COCC1.C(OCC)(=O)C>[Br:8][C:6]1[N:7]=[C:2]([NH:22][C@@H:23]([C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)[C@@H:24]([CH3:27])[CH2:25][OH:26])[C:3](=[O:21])[N:4]([C:9]2[CH:10]=[C:11]([CH:16]=[C:17]([F:20])[C:18]=2[CH3:19])[C:12]([O:14][CH3:15])=[O:13])[CH:5]=1

Participants

6

Reactant 3

HCID 81531DiisopropylethylamineHCID 12452700(2R,3R)-3-Amino-2-methyl-3-phenylpropan-1-olHCID 66689945methyl 3-(3,5-dibromo-2-oxo-1(2H)-pyrazinyl)-5-fluoro-4-methylbenzoate

Product 1

HCID 66690053Methyl 3-[5-bromo-3-{[(1R,2R)-3-hydroxy-2-methyl-1-phenylpropyl]amino}-2-oxopyrazin-1(2H)-yl]-5-fluoro-4-methylbenzoate

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
50 °C

Procedure

To methyl 3-(3,5-dibromo-2-oxopyrazin-1(2H)-yl)-5-fluoro-4-methylbenzoate (Example 252g, 0.9 g) in THF (3 mL) was added (2R,3R)-3-amino-2-methyl-3-phenylpropan-1-ol (Example 328a, 0.389 g) and Hunig's Base (0.374 mL) and the reaction stirred at 50° C. for 8 h. The reaction mixture was diluted with ethyl acetate and washed with aqueous NaHCO3. The organics were dried (MgSO4) and concentrated in vacuo to leave the crude product which was triturated overnight in 2:1 isohexane/diethyl ether to give the subtitle compound. Purification of the filtrate (SiO2 chromatography eluting with 50-100% diethyl ether in isohexane) to give further subtitle compound (total 0.820 g).

Workup

  1. washwashed with aqueous NaHCO3
  2. dry with materialThe organics were dried (MgSO4)
  3. concentrationconcentrated in vacuo
  4. customto leave the crude product which
  5. customwas triturated overnight in 2:1 isohexane/diethyl ether

Sources & evidence

ORD record
ord-0ed3cf46b05b4e5bbc8e5cdabe5cba92
Source dataset
uspto-grants-2012_04
Patent number
US08163905B2

Reaction notes

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