4-Formylbenzoic acid → (S)-3,5-dichloro-4-(2-(3,4-dimethoxyphenyl)-2-((4-formylbenzoyl)oxy)ethyl)pyridine 1-oxide

HRID 2284851Notes

Reaction equation

HRID 2284851 reaction equation
[Cl:1][C:2]1[CH:3]=[N+:4]([O-:22])[CH:5]=[C:6]([Cl:21])[C:7]=1[CH2:8][C@@H:9]([C:11]1[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[C:13]([O:19][CH3:20])[CH:12]=1)[OH:10].[CH:23]([C:25]1[CH:33]=[CH:32][C:28]([C:29](O)=[O:30])=[CH:27][CH:26]=1)=[O:24].Cl.CN(C)CCCN=C=NCC>CN(C)C1C=CN=CC=1.C(Cl)Cl>[Cl:21][C:6]1[CH:5]=[N+:4]([O-:22])[CH:3]=[C:2]([Cl:1])[C:7]=1[CH2:8][C@@H:9]([C:11]1[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[C:13]([O:19][CH3:20])[CH:12]=1)[O:10][C:29](=[O:30])[C:28]1[CH:32]=[CH:33][C:25]([CH:23]=[O:24])=[CH:26][CH:27]=1

Participants

6

Reactant 3

HCID 120884-Formylbenzoic acidHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 71092494(S)-3,5-dichloro-4-(2-(3,4-dimethoxyphenyl)-2-hydroxyethyl)pyridine 1-oxide

Product 1

HCID 86720687(S)-3,5-dichloro-4-(2-(3,4-dimethoxyphenyl)-2-((4-formylbenzoyl)oxy)ethyl)pyridine 1-oxideYield 91%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent

Procedure

A solution of (S)-3,5-dichloro-4-(2-(3,4-dimethoxyphenyl)-2-hydroxyethyl)pyridine 1-oxide (0.688 g, 2 mmol), 4-formylbenzoic acid (0.300 g, 2 mmol), N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (0.767 g, 4 mmol) and 4-(dimethylamino)pyridine (0.122 g, 1 mmol) in anhydrous DCM (30 mL) was stirred at RT for 21 h. The reaction mixture was partitioned between saturated aqueous NaHCO3 (20 mL) and DCM (10 mL) and filtered through a phase separator. The solvent was removed in vacuo and the crude material was purified by silica gel column chromatography eluting with 1:1 DCM:EtOAc to afford (S)-3,5-dichloro-4-(2-(3,4-dimethoxyphenyl)-2-((4-formylbenzoyl)oxy)ethyl)pyridine 1-oxide as an off-white solid (0.863 g, 91%).

Workup

  1. customThe reaction mixture was partitioned between saturated aqueous NaHCO3 (20 mL) and DCM (10 mL)
  2. filtrationfiltered through a phase separator
  3. customThe solvent was removed in vacuo
  4. customthe crude material was purified by silica gel column chromatography
  5. washeluting with 1:1 DCM

Sources & evidence

ORD record
ord-22620c3ea49247b8858ee99b1d391539
Source dataset
uspto-grants-2015_09
Patent number
US09145409B2

Reaction notes

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