Category: 939-18-4

Some common heterocyclic compound, 939-18-4, name is 3-Bromo-2H-chromen-2-one, molecular formula is C9H5BrO2, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route. name: 3-Bromo-2H-chromen-2-one

Step 2: 3-({3-[4-(isoquinolin-1 -yl)piperazin-1 -yl]propyl}amino)-2H-chromen- 2-one hydrochloride (87) A mixture of intermediates 31 b (50 mg, 0.185 mmoles, 1 eq.) and 87a (50 mg, 0.222 mmoles, 1 .2 eq.), Pd(OAc)2 (5 mg, 0.019 mmoles, 0.1 eq.), Xantphos (1 1 mg, 0.019 mmoles, 0.1 eq.) and Cs2C03 (90 mg, 0.28 mmoles, 1 .5 eq.) in 1 ,4-dioxane (2.5 ml_) was heated to 130C in a sealed tube under microwave irradiation for 2 hours. The reaction mixture was concentrated under reduced pressure and the residue was chromatographed on silica gel (SNAP25) eluting with a gradient of 0-2% mixture A in dichloromethane, where mixture A is MeOH/NH4OH 10:1 . The partially pure product was further purified by preparative LC-MS to give 20 mg of a yellow gum. The product was dissolved in dichloromethane (4 mL) and treated with 1 M HCI solution in diethyl ether (0.16 mL) causing precipitation. The resulting mixture was evaporated under reduced pressure and the residue was triturated with diethyl ether. The solids were dried to give 24 mg of 3-({3-[4-(isoquinolin-1 – yl)piperazin-1 -yl]propyl}amino)-2H-chromen-2-one hydrochloride 87 (Y=27%). LC-MS (M-H+) = 415.3. 1 H NMR (400MHz, DMSO-d6) delta = 1 1 .1 6 (br. s., 1 H), 8.19 (d, J=7.5 Hz, 1 H), 8.08 (d, J=5.8 Hz, 1 H), 8.00 (d, J=7.5 Hz, 1 H), 7.85 (t, J=6.5 Hz, 1 H), 7.70 (t, J=7.3 Hz, 1 H), 7.57 (d, J=5.3 Hz, 1 H), 7.47 (br. s., 1 H), 7.37 – 7.10 (m, 3H), 6.68 (s, 1 H), 6.27 (br. s., 1 H), 4.00 (d, J=12.3 Hz, 2H), 4.37 – 3.81 (m, 1 H), 3.64 (d, J=1 1 .0 Hz, 4H), 3.40 (d, J=9.3 Hz, 2H), 3.28 (d, J=5.8 Hz, 4H), 2.1 1 (br. quin, J=7.0 Hz, 2H)

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 939-18-4, its application will become more common.

Reference:
Patent; AZIENDE CHIMICHE RIUNITE ANGELINI FRANCESCO A.C.R.A.F. S.P.A.; OMBRATO, Rosella; GAROFALO, Barbara; MANGANO, Giorgina; CAPEZZONE DE JOANNON, Alessandra; CORSO, Gaia; MAGARO’, Gabriele; FURLOTTI, Guido; IACOANGELI, Tommaso; (108 pag.)WO2016/96631; (2016); A1;,
Ester – Wikipedia,
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In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 939-18-4, name is 3-Bromo-2H-chromen-2-one belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below. SDS of cas: 939-18-4

General procedure: Typically, (hetero)aryl bromide (1.0 mmol), thiazole derivatives(2.0 mmol), Pd-PEPPSI complexes (0.01e0.5 mol%), base (2 mmol),acid additive (0.3 mmol), and 3mL of DMAc solvent were addedinto a parallel reactor. After heating at 130 C for 4 h, the resultingmixture was cooled to room temperature. Subsequently, 25mL ofwater and 20 mL of dichloromethane were added into the reactor,and the mixture was stirred for another several minutes, followedby extraction three times with dichloromethane (3 x 5 mL). Theorganic layer was then combined, dried over anhydrous sodiumsulfate, filtered, and evaporated under reduced pressure to give thecrude products. The crude products were then purified by silica-gelcolumn chromatography using petroleum etheredichloromethane(15/1) as the eluent. The obtained pure products were characterizedby 1H NMR and 13C NMR spectroscopy, and the spectra can be foundin the Supporting Information. And the isolated yields of productswere obtained based on the amounts of (hetero)aryl bromides.

The synthetic route of 939-18-4 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Ma, Bei-Bei; Lan, Xiao-Bing; Shen, Dong-Sheng; Liu, Feng-Shou; Xu, Chang; Journal of Organometallic Chemistry; vol. 897; (2019); p. 13 – 22;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics