Reference of 174508-31-7, A common heterocyclic compound, 174508-31-7, name is 5,7-Dibromo-2,3-dihydrothieno[3,4-b][1,4]dioxine, molecular formula is C6H4Br2O2S, its 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.
To 5,7-dibromo-2,3-dihydrothieno[3,4-b]-1,4-dioxin were added 2.0 equivalents of tert-butyl 4-tributyltin-2,3-dihydro-2-oxo-1H-thieno[3,4-d]imidazole-1-carboxylate obtained in the same manner as described in Example 7, dry 1,4-dioxane in an amount equivalent to 10 ml/mol relative to 5,7-dibromo-2,3-dihydrothieno[3,4-b]-1,4-dioxin, and 0.1 equivalents of trans-dichlorobistriphenylphosphine palladium. Under argon gas atmosphere, a reaction was advanced by refluxing at 120 C. for 40 hours, and then the reaction was stopped by adding an excessive amount of a saturated aqueous ammonium chloride solution. The resulting reaction liquid was filtered while being diluted with ethyl acetate, and to the resulting filtrate was added three-fold volume of a saturated aqueous potassium fluoride solution, followed by stirring for 2 hours. After the removal of the aqueous phase and insoluble matter, the organic layer containing the product was dried over sodium sulfate, then the solvent was distilled off, and the residue was purified by silica gel column chromatography using an ethyl acetate/hexane solvent, so that tert-butyl 4-[7-(2,3-dihydro-2-oxo-1-tert-butoxycarbonyl-1H-thieno[3,4-d]imidazol-4-yl)-2,3-dihydrothieno[3,4-b]-1,4-dioxin-5-yl]-2,3-dihydro-2-oxo-1H-thieno[3,4-d]imidazole-1-carboxylate was obtained.
The synthetic route of 174508-31-7 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; Kuraray Co., Ltd.; Kondou, Yoshirou; Nakano, Kirihiro; Otake, Tomiaki; US8519150; (2013); B2;,
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