Hydrochloric Acid → cis-2-{(2-Cyclopropylethyl)-[2-(7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1lambda6-benzo[1,2,4]thiadiazin-3-yl)acetyl]amino}-cyclopentanecarboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of cis-2-(2-cyclopropylethylamino)-cyclopentanecarboxylic acid ethyl ester (42.7 mg, 0.189 mmol) in N,N-dimethylformamide (3.0 mL) was added (7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-acetic acid (prepared as described in Example 1j, 94.8 mg, 0.284 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (73.9 mg, 0.378 mmol), and 4-dimethylaminopyridine (5.8 mg, 0.047 mmol). After stirring at 25° C. for 14 h, the mixture was diluted with ethyl acetate and acidified with 1.0 M aqueous hydrochloric acid solution. The layers were separated and the organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo to afford the crude product, cis-2-{(2-cyclopropylethyl)-[2-(7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)acetyl]amino}-cyclopentanecarboxylic acid ethyl ester, as a yellowish oil. The crude product was used in the next step without further purification. LC-MS (ESI) calcd for C23H32N4O7S2 540.17, found 541.4 [M+H+].

Provenance & Evidence