Hydrochloric Acid → 4-Hydroxy-7-iodo-1-oxo-1,2-dihydro-isoquinoline-3-carboxylic acid butyl ester

HRID 523760Notes

Reaction equation

[Na].[CH3:2][O:3][C:4](=[O:18])[CH2:5][N:6]1[C:14](=[O:15])[C:13]2[C:8](=[CH:9][CH:10]=[C:11]([I:16])[CH:12]=2)[C:7]1=[O:17].[O-][CH2:20][CH2:21][CH2:22]C.[Na+].Cl>C(O)CCC>[CH2:2]([O:3][C:4]([C:5]1[NH:6][C:14](=[O:15])[C:13]2[C:8]([C:7]=1[OH:17])=[CH:9][CH:10]=[C:11]([I:16])[CH:12]=2)=[O:18])[CH2:20][CH2:21][CH3:22]

Participants

Conditions

Temperature: 80 °C

Procedure

Freshly cut sodium metal, 0.40 g, was dissolved in 22 ml of n-butanol at 65° C. under a nitrogen atmosphere. A mixture of 3.0 g of (5-iodo-1,3-dioxo-1,3-dihydro-isoindol-2-yl)-acetic acid methyl ester in 22 ml of n-butanol was added to the sodium butoxide solution and the reaction mixture was heated to 80° C. for 2 h. The cooled reaction mixture was acidified with 100 ml of 1M hydrochloric acid to give a solid precipitate. The solid was collected by filtration and separated by silica gel chromatography (eluant; 19:1 dichloromethane:ethyl acetate) to give 0.219 g of 4-hydroxy-7-iodo-1-oxo-1,2-dihydro-isoquinoline-3-carboxylic acid butyl ester: MS-(−)-ion, M−1=386.0 amu, and 0.150 g of 4-hydroxy-6-iodo-1-oxo-1,2-dihydro-isoquinoline-3-carboxylic acid butyl ester: MS-(−) ion, M−1=386.0 amu.

Workup

customThe cooled reaction mixture
customto give a solid precipitate
filtrationThe solid was collected by filtration
customseparated by silica gel chromatography (eluant; 19:1 dichloromethane:ethyl acetate)

Sources & evidence

ORD record: ord-e4f1687606e149c9b92beb296d1b9415
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09339527B2

Reaction notes

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