Hydrochloric Acid → 4-((Z)-(4-(2-fluorobenzyl)-3,4-dihydro-3-oxobenzo[b][1,4]thiazin-2-ylidene)methyl)benzoic acid

HRID 576501Notes

Reaction equation

[F:1][C:2]1[CH:19]=[CH:18][CH:17]=[CH:16][C:3]=1[CH2:4][N:5]1[C:10](=[O:11])[CH2:9][S:8][C:7]2[CH:12]=[CH:13][CH:14]=[CH:15][C:6]1=2.[CH:20]([C:22]1[CH:31]=[CH:30][C:25]([C:26]([O:28]C)=[O:27])=[CH:24][CH:23]=1)=O.CC[O-].[Na+].Cl>C1COCC1>[F:1][C:2]1[CH:19]=[CH:18][CH:17]=[CH:16][C:3]=1[CH2:4][N:5]1[C:10](=[O:11])/[C:9](=[CH:20]/[C:22]2[CH:31]=[CH:30][C:25]([C:26]([OH:28])=[O:27])=[CH:24][CH:23]=2)/[S:8][C:7]2[CH:12]=[CH:13][CH:14]=[CH:15][C:6]1=2

Participants

Conditions

Temperature: 70 °C

Procedure

4-(2-fluorobenzyl)-2H-benzo[b][1,4]thiazin-3(4H)-one (1 g, 3.66 mmole) and methyl 4-formylbenzoate (1.2 g) were dissolved in THF (20 mL) and to the solution was added NaOEt (1 g). The reaction solution was heated at 70° C. overnight and aqueous HCl (5%, 10 mL) was added to quench the reaction. The mixture was extracted with EtOAc (50 mL) twice and combined organic layers were dried over anhydrous magnesium sulfate. After filtration, the solvent was removed under vacuum to give 4-((Z)-(4-(2-fluorobenzyl)-3,4-dihydro-3-oxobenzo[b][1,4]thiazin-2-ylidene)methyl)benzoic acid (1.13 g, 71%).

Workup

customto quench
customthe reaction
extractionThe mixture was extracted with EtOAc (50 mL) twice
dry with materialwere dried over anhydrous magnesium sulfate
filtrationAfter filtration
customthe solvent was removed under vacuum

Sources & evidence

ORD record: ord-6744debc17454cfeb0e8d060cbb403f2
Source dataset: uspto-grants-2015_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09040508B2

Reaction notes

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