Dimethylacetamide → Diethyl (2-((4-((3-bromo-4-chlorophenyl)amino)pyrido[3,4-d]pyrimidin-6-yl)amino)-2-oxoethyl)phosphonate

HRID 511806Notes

Reaction equation

HRID 511806 reaction equation
C1N=CN(C(N2C=NC=C2)=O)C=1.[CH2:13]([O:15][P:16]([CH2:21][C:22]([OH:24])=O)([O:18][CH2:19][CH3:20])=[O:17])[CH3:14].[Br:25][C:26]1[CH:27]=[C:28]([NH:33][C:34]2[C:35]3[CH:43]=[C:42]([NH2:44])[N:41]=[CH:40][C:36]=3[N:37]=[CH:38][N:39]=2)[CH:29]=[CH:30][C:31]=1[Cl:32].CC(N(C)C)=O>C1COCC1.O.ClCCl.CO>[Br:25][C:26]1[CH:27]=[C:28]([NH:33][C:34]2[C:35]3[CH:43]=[C:42]([NH:44][C:22](=[O:24])[CH2:21][P:16](=[O:17])([O:15][CH2:13][CH3:14])[O:18][CH2:19][CH3:20])[N:41]=[CH:40][C:36]=3[N:37]=[CH:38][N:39]=2)[CH:29]=[CH:30][C:31]=1[Cl:32]

Participants

8

Reactant 4

HCID 31374DimethylacetamideHCID 36704(Diethoxyphosphinyl)acetic acid2×HCID 682631,1'-Carbonyldiimidazole2×HCID 86668938N4-(3-bromo-4-chlorophenyl)pyrido[3,4-d]pyrimidine-4,6-diamine

Product 1

HCID 86668939Diethyl (2-((4-((3-bromo-4-chlorophenyl)amino)pyrido[3,4-d]pyrimidin-6-yl)amino)-2-oxoethyl)phosphonateYield 94.4%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent4×HCID 21226129Dichloromethane methanolSolvent

Conditions

Temperature
40 °C

Procedure

To a stirred mixture of CDI (1.20 g, 7.42 mmol) and dry THF (5 mL), at room temperature and under a nitrogen atmosphere, was added a solution of 2-(diethoxyphosphoryl)acetic acid (1.45 g, 7.42 mmol) in THF (4 mL). After addition the reaction mixture was stirred further at 40° C. (bath) for 15 min (whence evolution of gases ceased). A solution of compound 223 (2.00 g, 5.71 mmol) in a mixed solvents of dry THF (6 mL) and DMA (7 mL) was added and stirred further at 40° C. The reaction was monitored by TLC (dichloromethane-MeOH=10:1) and found only ca. 60% reaction occurred after 1 h. Thus, another batch of reagent was prepared from CDI [0.87 g, 5.37 mmol; dry THF (2.5 mL)] and 2-(diethoxyphosphoryl)acetic acid [0.72 g, 5.37 mmol); THF (3 mL)] and added to the reaction. It was stirred further for 3 h at 40° C. The reaction mixture was poured into water (300 mL) and stirred with petroleum ether (400 mL) at room temperature for 20 min. Petroleum ether layer was decanted. It was repeated once more with petroleum ether (400 mL). The solid was collected by suction filtration; washed with water (5×30 mL) and dried to give diethyl 2-(4-(3-bromo-4-chlorophenylamino)pyrido[3,4-d]pyrimidin-6-ylamino)-2-oxoethylphosphonate (232) (2.85 g, 94%); mp 113-116° C.; 1H NMR δ [(CD3)2SO]: 10.86 (s, 1H), 10.40 (s, 1H), 9.04 (s, 1H), 8.87 (s, 1H), 8.67 (s, 1 H), 8.34 (d, J=2.3 Hz, 1H), 7.94 (dd, J=8.8, 2.3 Hz, 1H), 7.65 (d, J=8.8 Hz, 1H), 4.16-4.03 (m, 4H), 3.32 (d, partially obscured by water peak, 2H), 1.26 (t, J=7.1 Hz, 6H). Anal. Calcd for C19H20BrClN5O4P.H2O: C, 41.74; H, 4.06; N, 12.81%. Found C, 42.01; H, 3.90; N, 12.78%.

Workup

  1. additionAfter addition the reaction mixture
  2. stirringstirred further at 40° C
  3. customca. 60% reaction
  4. waitoccurred after 1 h
  5. stirringIt was stirred further for 3 h at 40° C
  6. customPetroleum ether layer was decanted
  7. filtrationThe solid was collected by suction filtration
  8. washwashed with water (5×30 mL)
  9. customdried

Sources & evidence

ORD record
ord-f4ccd15749ad47ae989a449d2beaa80d
Source dataset
uspto-grants-2015_08
Patent number
US09101632B2

Reaction notes

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