These common heterocyclic compound, 75148-49-1, name is 3-Bromobenzaldehyde Diethyl Acetal, 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. Formula: C11H15BrO2
Step 1: Preparation of 3-(3-aminooxetan-3-yl)benzaldehyde Hydrochloride 3-Bromobenzaldehyde diethyl acetal (11.65 g, 45 mmol) in dry THF (100 mL) at -78 C. was added n-butyl lithium (2.5 M in hexanes, 19 mL, 47 mmol) dropwise. The sample was stirred at -78 C. for ten minutes then added 2-methyl-N-(oxetan-3-ylidene)propane-2-sulfonamide (7.5 g, 43 mmol) dropwise. The sample was stirred at -78 C. for one hour. The mixture was diluted with 200 mL saturated ammonium chloride solution and 200 mL ethyl acetate. The layers were shaken and separated and the organic phase was dried over magnesium sulfate and concentrated under reduced pressure. The crude mixture was dissolved in ethyl acetate (250 mL). The reaction mixture was cooled to 0 C. was added 1M hydrochloric acid in ethyl acetate dropwise (24 mL, 24 mmol). The reaction mixture was stirred at 0 C. for one hour then vacuum filtered to give the desired product as a slightly off white solid (1.97 g, 9.2 mmol). 1H NMR (400 MHz, DMSO-d6) delta 10.08 (s, 1H), 9.18 (s, 3H), 8.09 (s, 1H), 8.01 (d, J=7.9 Hz, 1H), 7.91 (d, J=7.9 Hz, 1H), 7.79-7.73 (m, 1H), 5.03-4.91 (m, 4H).
The synthetic route of 3-Bromobenzaldehyde Diethyl Acetal has been constantly updated, and we look forward to future research findings.
Reference:
Patent; AMGEN INC.; CYTOKINETICS, INC.; Ashcraft, Luke; Boezio, Alessandro; Butler, John; Chandra, Aroop; Chuang, Chihyuan; Collibee, Scott E.; Debenedetto, Mikkel; DiMassa, Vincent; Graceffa, Russell; Malinowski, Justin; Moebius, David; Morgan, Bradley P.; Payette, Joshua; Romero, Antonio; St. Jean, JR., David; Vargas, Richard; Yeoman, John; Zhang, Hanmo; (146 pag.)US2019/77793; (2019); A1;,
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