ChemicalBook CAS DataBase List 5-NITROISATOIC ANHYDRIDE

5-NITROISATOIC ANHYDRIDE synthesis

9synthesis methods

Product Name:5-NITROISATOIC ANHYDRIDE
CAS Number:4693-02-1
Molecular formula:C8H4N2O5
Molecular Weight:208.13

5-Nitroisatoic anhydride is prepared from 5-nitro indole (9g) by stirring in a 4:1 mixture of CH3CN/H2O for 1 h at 40℃. 1 H NMR (DMSO-d6): δ12.34 (s, Br., 1H), 8.59 (s Hz, 1H), 8.51 (d, J = 7.8 Hz, 1H), 7.31 (d, J = 8.7 Hz, 1H).

32315-10-9 Synthesis

32315-10-9
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616-79-5 Synthesis

616-79-5
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$8.00/5g

4693-02-1
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Yield:4693-02-1 75%

Reaction Conditions:

in tetrahydrofuran at 70; for 12 h;

Steps:

General procedure for isatoic anhydride synthesis 6-Bromo-2H-benzo[d][1,3]oxazine-2,4(1H)-dione (9b).
General procedure: A 500 mL single neck round-bottomed flask equipped with a football-shaped PTFE stirring bar (16 mm × 37 mm) was chargedwith 2-amino-5-bromobenzoic acid (10.0 g, 46.3 mmol,1.0 equiv) followed by the addition of tetrahydrofuran (230 mL,0.2 molar) and solid triphosgene (13.7 g, 46.3 mmol, 1.0 equiv)resulting in a suspension. The reaction vessel was placed into afitted metal heating mantle and the neck was equipped with a24/40 Liebig condenser. The suspension was stirred (500 rpm)and the heating mantle set to 70 °C. The suspension becamehomogenous before a white solid precipitated out after about30 minutes at 70 °C. The heterogeneous reaction mixture wasaged for 12 hours then cooled to room temperature (25 °C). Theslurry was poured into a 600 mL beaker equipped with overheadmechanical stirrer (PTFE 75 mm paddle) containing250 mL of deionized water. With vigorous stirring, the mixturebecame homogenous followed by precipitation of a pale whitesolid. The solid was collected by vacuum filtration on aBüchner funnel (7.6 cm diameter) with Whatman 1 filter paper(70 mm) and air pulled through for 5 minutes. The material was transferred to a 250 mL Erlenmeyer flask equipped with cylindricalstir bar and 50 mL of methanol was added. The slurrywas stirred for 10 minutes and then collected by vacuum filtration.The filter cake was dried under vacuum (0.1 mmHg at 25 °C) for 12 hours to afford 9b as a white powder (90% yield).

References:

Jentsch, Nicholas G.;Hume, Jared D.;Crull, Emily B.;Beauti, Samer M.;Pham, Amy H.;Pigza, Julie A.;Kessl, Jacques J.;Donahue, Matthew G. [Beilstein Journal of Organic Chemistry,2018,vol. 14,p. 2529 - 2536]

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118-48-9 Synthesis