Adding a certain compound to certain chemical reactions, such as: 40876-98-0, name is Sodium 1,4-diethoxy-1,4-dioxobut-2-en-2-olate, belongs to esters-buliding-blocks compound, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 40876-98-0, Application In Synthesis of Sodium 1,4-diethoxy-1,4-dioxobut-2-en-2-olate
[4-((1R,5S,7S)-(1S,6R,8R)-9-bicyclo[4.3.1]dec-8-yl-3-oxa-9-aza-bicyclo[3.3.1]non-7-yl)-3-oxo-3,4-dihydro-quinoxalin-2-yl]-acetic acid ethyl ester (d6) To a solution of c1 (578 mg, 1.64 mmol) in ethanol (6 mL) was added oxalacetic acid diethyl ester sodium salt (977 mg, 4.41 mmol) and acetic acid (0.505 mL, 8.83 mmol) at temperature of about 25 C. under a nitrogen atmosphere. The mixture was stirred at 100 C. for 8 hr. The reaction mixture was diluted with saturated aqueous NaHCO3, then extracted with CHCl3 (2*30 mL). The combined organic phases were washed with saturated aqueous NaCl and dried (MgSO4) and concentrated. The resulting brown solid was chromatographed (silica-gel 45 g, AcOEt/n-hexane=1/3?1/0) to provide 385 mg of compound d6 as a light brown solid. (Yield 49%) d6: 1H-NMR (300 MHz, CDCl3) delta: 1.23-1.38 (m, 2H), 1.28 (t, J=7.2 Hz, 3H), 1.42-1.88 (m, 12H), 2.08-2.32 (m, 4H), 2.35-2.60 (m, 2H), 3.14 (m, 1H), 3.33 (d, J=10.8 Hz, 2H), 3.64 (d, J=10.8 Hz, 2H), 3.74-3.84 (m, 2H), 3.94 (s, 2H), 4.22 (q, J=7.2 Hz, 2H), 5.94 (m, 1H), 7.30 (t, J=7.8 Hz, 1H), 7.53 (td, J=1.2 Hz, 7.8 Hz, 1H), 7.83 (dd, J=1.2 Hz, 7.8 Hz, 1H), 8.18 (brs, 1H); LC/MS: m/z=494.3[M+H]+ (Calc: 493).
At the same time, in my other blogs, there are other synthetic methods of this type of compound, Sodium 1,4-diethoxy-1,4-dioxobut-2-en-2-olate, and friends who are interested can also refer to it.
Reference:
Patent; Shionogi & Co., Ltd.; Purdue Pharma L.P.; MARRA, Jeffrey Michael; Tsuno, Naoki; Ueno, Tatsuhiko; Zhou, Xiaoming; US2014/187544; (2014); A1;,
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