methyl 2-hydroxy-5-(5Z,8Z,11Z,14Z)-icosa-5,8,11, 14-tetraenamidobenzoate → 2-hydroxy-5-(5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenamidobenzoic acid

HRID 919151Notes

Reaction equation

[OH:1][C:2]1[CH:11]=[CH:10][C:9]([NH:12][C:13](=[O:33])[CH2:14][CH2:15][CH2:16]/[CH:17]=[CH:18]\[CH2:19]/[CH:20]=[CH:21]\[CH2:22]/[CH:23]=[CH:24]\[CH2:25]/[CH:26]=[CH:27]\[CH2:28][CH2:29][CH2:30][CH2:31][CH3:32])=[CH:8][C:3]=1[C:4]([O:6]C)=[O:5]>C1COCC1.[OH-].[Na+]>[OH:1][C:2]1[CH:11]=[CH:10][C:9]([NH:12][C:13](=[O:33])[CH2:14][CH2:15][CH2:16]/[CH:17]=[CH:18]\[CH2:19]/[CH:20]=[CH:21]\[CH2:22]/[CH:23]=[CH:24]\[CH2:25]/[CH:26]=[CH:27]\[CH2:28][CH2:29][CH2:30][CH2:31][CH3:32])=[CH:8][C:3]=1[C:4]([OH:6])=[O:5]

Participants

Conditions

Temperature: 60 °C

Procedure

The methyl 2-hydroxy-5-(5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenamidobenzoate was then dissolved in THF (15 mL) and 3 N NaOH (5 mL). The mixture was heated (60° C., 2 h) and then concentrated and acified to pH 3 with 2 N HCl. The product was extracted with ethyl acetate, and the combined organic extracts were washed with brine and dried over MgSO4. The crude product was purified by silica chromatography (0-15% MeOH/CH2Cl2) to afford 0.3 g of as 2-hydroxy-5-(5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenamidobenzoic acid an orange solid. Mass calculated for C27H37NO4=439.59. found: [M−H]+=438.3.

Workup

concentrationconcentrated
extractionThe product was extracted with ethyl acetate
washthe combined organic extracts were washed with brine
dry with materialdried over MgSO4
customThe crude product was purified by silica chromatography (0-15% MeOH/CH2Cl2)

Sources & evidence

ORD record: ord-a50813b1a7cb4097a85da1f94ee9a15b
Source dataset: uspto-grants-2016_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09272984B2

Reaction notes

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