112-1. A mixture of 9-iodo-3,4,7,8-tetrahydro-[1,4]diazepino[7,1-a]isoquinoline-2,5-dione (520 mg, 1.47 mmol), oxazole (0.24 mL, 3.67 mmol), Pd(OAc)2 (49 mg, 0.22 mmol), di-tert-butyl(2′,4′,6′-triisopropyl-3,4,5,6-tetramethyl-[1,1′-biphenyl]-2-yl)phosphine (141 mg, 0.29 mmol), K2CO3 (609 mg, 4.40 mmol) and pivalic acid (68 μL, 0.59 mmol) in DMA (4 mL) was heated to 120° C. for 1 h in a microwave reactor. The mixture was then filtered and the filtrate was concentrated in vacuo. Purification of the obtained residue by flash chromatography (SiO2, AcOEt/MeOH 99:1 to 90:10) afforded the title compound (140 mg) as a beige powder. UPLC-MS: MS 296.1 (M+H+); UPLC rt 0.60 min.
