Hydrochloric Acid → (7-Methanesulfonylamino-1,1-dioxo-1,4-dihydro-1lambda6-benzo[1,4]thiazin-3-yl)-acetic acid

HRID 1177017Notes

Reaction equation

C([O:3][C:4](=[O:23])[CH2:5][C:6]1[NH:11][C:10]2[CH:12]=[CH:13][C:14]([NH:16][S:17]([CH3:20])(=[O:19])=[O:18])=[CH:15][C:9]=2[S:8](=[O:22])(=[O:21])[CH:7]=1)C.[OH-].[Li+].Cl>CO>[CH3:20][S:17]([NH:16][C:14]1[CH:13]=[CH:12][C:10]2[NH:11][C:6]([CH2:5][C:4]([OH:23])=[O:3])=[CH:7][S:8](=[O:21])(=[O:22])[C:9]=2[CH:15]=1)(=[O:18])=[O:19]

Participants

Conditions

Temperature: 25 °C

Procedure

A solution of (7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,4]thiazin-3-yl)-acetic acid ethyl ester (Example 8g, 0.245 g, 0.680 mmol) in methanol (15 mL) was cooled to 0° C. in an ice-water bath and treated with 2.0 M aqueous lithium hydroxide solution (1.7 mL, 3.40 mmol). The reaction mixture was allowed to warm to 25° C. and stirred for 1 h. The reaction was poured into 0.5 M aqueous hydrochloric acid solution (50 mL) on ice, extracted with ethyl acetate (3×50 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo to give an orange solid. The crude solid was triturated with diethyl ether to afford the desired product, (7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,4]thiazin-3-yl)-acetic acid (0.175 g, 0.526 mmol, 77% yield) as a light orange solid. LC-MS (ESI) calcd for C11H12N2O6S2 332.4. found 333.3 [M+H+].

Workup

extractionextracted with ethyl acetate (3×50 mL)
dry with materialdried over magnesium sulfate
filtrationfiltered
concentrationconcentrated in vacuo
customto give an orange solid
customThe crude solid was triturated with diethyl ether

Sources & evidence

ORD record: ord-c5537de60f324fd7aab072224ae04868
Source dataset: uspto-grants-2010_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07842838B2

Reaction notes

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