Tri-o-tolylphosphine → (E)-3-(3,3-Dimethyl-2-oxo-2,3,4,5-tetrahydro-1H-pyrido[2,3-e][1,4]diazepin-7-yl)-N-(3-isopropyl-2-propoxybenzyl)-N-methylacrylamide

Participants

Reaction Steps

A solution of N-(3-isopropyl-2-propoxybenzyl)-N-methylacrylamide (0.397 g, 1.47 mmol) in propionitrile (5 mL) and DMF (1 mL) was deoxygenated with Ar for 20 min. The solution was treated with diisopropylethylamine (0.40 mL, 2.33 mmol) and 7-bromo-3,3-dimethyl-1,3,4,5-tetrahydro-pyrido[2,3-e][1,4]diazepin-2-one (0.300 g, 1.11 mmol). The solution was deoxygenated with Ar for 20 min. Pd(OAc)2 (0.024 g, 0.111 mmol) and P(o-tol)3 (0.067 g, 0.222 mmol) were then added and the mixture deoxygenated with Ar for 20 min. The mixture was heated to reflux for 18 h, then allowed to cool. The solution was diluted with EtOAc (30 mL) and H2O (50 mL). The aqueous layer was extracted with EtOAc (3×50 mL). The combined organics were washed with brine (2×100 mL), dried over Na2SO4, filtered and concentrated to an orange oil. Purification by column chromatography (silica gel, CH2Cl2/MeOH, 100 to 95:5) gave the title compound (0.16 g, 31%) as an off-white solid and as a mixture of amide rotamers: 1H NMR (300 MHz, DMSO-d6) δ 9.80-9.77 (m, 1H), 8.40-8.35 (m, 1H), 8.01-7.91 (m, 1H), 7.55-7.48 (m, 1H), 7.31-7.20 (m, 2H), 7.10-7.03 (m, 1H), 6.88-6.85 (m, 1H), 4.81-4.66 (m, 2H), 3.90-3.83 (m, 2H), 3.77-3.69 (m, 2H), 3.32-3.25 (m, 1H), 3.12-2.90 (m, 4H), 1.81-1.77 (m, 2H), 1.31-1.28 (m, 6H), 1.19-1.17 (m, 6H), 1.06-1.01 (3H).

Provenance & Evidence