Tri-o-tolylphosphine → (E)-N-Methyl-N-(3-methylbenzofuran-2-ylmethyl)-3-(2-oxo-2,3,4,5-tetrahydro-1H-pyrido[2,3-e][1,4]diazepin-7-yl)acrylamide

Participants

Reaction Steps

A suspension of 7-bromo-1,3,4,5-tetrahydropyrido[2,3-e][1,4]diazepin-2-one hydrochloride (0.29 g, 1.0 mmol) and N-methyl-N-(3-methylbenzofuran-2-ylmethyl)acrylamide (0.29 g, 1.3 mmol) in propionitrile (5 mL) and DMF (1.3 mL) was de-oxygenated with Ar for 10 min. The mixture was treated with (i-Pr)2EtN (0.56 mL, 3.2 mmol) and was de-oxygenated with Ar for 5 min. Pd(OAc)2 (24 mg, 0.11 mmol) and P(o-tol)3 (64 mg, 0.21 mmol) were added simultaneously, and the mixture was de-oxygenated a third time for 5 min. The mixture was heated to reflux overnight, then allowed to cool. The resulting precipitate was isolated by filtration, dissolved in CH2Cl2/MeOH and the solvent was removed in vacuo. Purification by flash column chromatography (silica gel, CH2Cl2/MeOH, 98:2 to 96:4) gave the title compound (0.18 g, 47%) as a white solid: MS (ESI) m/e 391 (M+H)+.

Provenance & Evidence