Triethylamine → HCID 59853577, compound

HRID 2374379Notes

Reaction equation

[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][C:3]=1[SH:11].C(N(CC)CC)C.Cl[CH2:20][C:21](=O)[CH2:22][C:23]([O:25][CH2:26][CH3:27])=[O:24]>O1CCCC1>[CH2:26]([O:25][C:23](=[O:24])[CH2:22][C:21]1[NH:1][C:2]2[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][C:3]=2[S:11][CH:20]=1)[CH3:27]

Participants

Conditions

Temperature: 25 °C

Procedure

A solution of 2-amino-5-nitro-benzenethiol (Example 8a, 4.1 g, 23.9 mmol) in tetrahydrofuran (60 mL) was treated with triethylamine (4.8 g, 47.8 mmol) and ethyl chloroacetoacetate (4.3 g, 26.3 mmol). The reaction mixture was stirred at 25° C. for 12 h, concentrated in vacuo, taken up in ethyl acetate, and heated at 80° C. for 3 h. The reaction mixture was allowed to cool to 25° C., washed with brine solution, dried over sodium sulfate, and concentrated in vacuo. The resulting brown solid was triturated with diethyl ether to afford the desired product, (7-nitro-4H-benzo[1,4]thiazin-3-yl)-acetic acid ethyl ester (5.8 g, 20.7 mmol, 87% yield) as a yellow solid. 1H NMR (400 MHz, CDCl3) δ 1.32 (t, 3H, J=7.1 Hz), 3.49 (s, 2H), 4.21 (q, 2H, J=7.0 Hz), 4.89 (s, 1H), 6.91 (d, 1H, J=8.7 Hz), 8.00 (dd, 1H, J1=9.5 Hz, J2=2.3 Hz), 8.12 (d, 1H, J=3.1 Hz), 10.95 (bs, 1H). LC-MS (ESI) calcd for C12H12N2O4S [M+H+] 281.05. found 281.23 [M+H+].

Workup

concentrationconcentrated in vacuo
temperatureheated at 80° C. for 3 h
temperatureto cool to 25° C.
washwashed with brine solution
dry with materialdried over sodium sulfate
concentrationconcentrated in vacuo
customThe resulting brown solid was triturated with diethyl ether

Sources & evidence

ORD record: ord-a9a24928ba99472eaf4fd116a7323947
Source dataset: uspto-grants-2008_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07462611B2

Reaction notes

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