Furo[3,4-b]pyridine-5,7-dione, 3-bromo- synthesis

Yield: 94%

Reaction Conditions:

with acetic anhydride at 80; for 2 h;

Steps:

3-Bromofuro[3,4-b]pyridine-5,7-dione (42)
A mixture of 5-bromopyridine-2,3-dicarboxylic acid (41, 10.0 g, 40.6mmol) and acetic anhydride (20 mL, 200 mmol) was stirred at 80 °C for 2 h. The reaction mixture wasconcentrated in vacuo, and the residual solid was triturated with hexanes to afford the title compound 42 (8.69 g,94%) as a pale yellow powder

References:

Maezaki, Hironobu;Tawada, Michiko;Yamashita, Tohru;Banno, Yoshihiro;Miyamoto, Yasufumi;Yamamoto, Yoshio;Ikedo, Koji;Kosaka, Takuo;Tsubotani, Shigetoshi;Tani, Akiyoshi;Asakawa, Tomoko;Suzuki, Nobuhiro;Oi, Satoru [Bioorganic and Medicinal Chemistry Letters,2017,vol. 27,# 15,p. 3565 - 3571] Location in patent:supporting information