3-Butyn-1-OL → HCID 9844719, compound

Participants

Reaction Steps

To a suspension of 2-bromo-N-(4-chlorobenzyl)-7-ethyl4-oxo-4,7-dihydro-thieno[2,3-b]pyridine-5-carboxamide (Example No. 11) (0.500 g) in diethylamine (12 mL) is added copper iodide (0.067 g) and Pd(PPh3)2Cl2 (0.041 g) followed by addition of 3-butyn-1-ol (0.11 mL). The reaction is stirred at rt for 3 d. The diethylamine is removed in vacuo and the resulting residue is partitioned between H2O (50 mL) and CH2Cl2 (50 mL). The organic layer is removed, and the aqueous layer is extracted with CH2Cl2 (3×50 mL). The combined organic layers are washed with a saturated NH4Cl solution (50 mL), dried with MgSO4, filtered, and concentrated in vacuo. The resulting orange solid is purified by column chromatography (CH2Cl2:CH3OH, 98:2). Fractions homogeneous by TLC are combined and concentrated in vacuo. The resulting yellow solid is recrystallized from methanol to yield 0.312 g (64%) of the title compound as a pale yellow, crystalline solid.

Provenance & Evidence