Oxalyl chloride → 7-Chlorothieno[3,2-b]pyridine-2-carbonyl chloride

A 100 mL round bottom flask was charged with lithium 7-chlorothieno[3,2-b]pyridine-2-carboxylate (0.500 g, 2.28 mmol), methylene chloride (15 ml), and 6 drops of DMF. Oxalyl chloride (0.248 ml, 2.85 mmol) was added dropwise, and the reaction mixture was stirred at room temperature for 3 hours then concentrated in vacuo to yield 7-chlorothieno[3,2-b]pyridine-2-carbonyl chloride as a brown solid. This material was suspended in chloroform (5 mL). N′-hydroxyacetamidine (0.186 g, 2.50 mmol), triethylamine (0.347 ml, 2.50 mmol), and chloroform (15 mL) were stirred together in a 50 mL flask to form a slurry, which was slowly added to the 7-chlorothieno[3,2-b]pyridine-2-carbonyl chloride suspension, then stirred for 1.5 hours at room temperature. The reaction mixture was diluted with chloroform (50 mL) and washed with water (50 mL), sat. aq. NaHCO3 (50 mL) and brine (50 mL). The organic layer was dried with MgSO4, filtered, and concentrated in vacuo. The resulting brown solid was triturated with toluene, and the precipitate collected to obtain the title compound (0.282 g, 46% yield) as a tan solid.

1. concentrationthen concentrated in vacuo

ORD record

ord-270c5b4cbabc4f6882cc500c1e383547

Source dataset

uspto-grants-2014_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08685983B2