Water → tert-butyl (1-{4-[2-(1,3-thiazol-2-yl)-9H-imidazo[1,2-d]pyrido[2,3-b][1,4]benzodiazepin-3-yl]phenyl}cyclobutyl)carbamate

Participants

Reaction Conditions

Reaction Steps

A mixture of tert-butyl {1-[4-(2-bromo-9H-imidazo[1,2-d]pyrido[2,3-b][1,4]benzodiazepin-3-yl)phenyl]cyclobutyl}carbamate (300 mg, 0.54 mmol), 2-(tributylstannyl)thiazole (337 μA, 1.1 mmol), and PdCl2(PPh3)2 (38 mg, 0.047 mmol) in 1,2-dimethoxyethane (10 ml) was added to a crimp top microwave vial, which was then sealed and heated under microwave irradiation conditions at 130° C. for 60 min. After cooling to room temperature the mixture was poured into water and extracted into ethyl acetate. The organic layers were washed with brine and dried over anhydrous Na2SO4. After filtration the solvent was evaporated in vacuo. The crude product was purified by silica gel chromatography (hexane/ethyl acetate; 0-100% ethyl acetate over 60 min) to give a yellow amorphous (quant.). 1HNMR (CDCl3) 400 MHz δ: 8.18 (1H, dd, J=7.7, 1.4 Hz), 8.02 (1H, d, J=4.0 Hz), 7.75 (1H, d, J=2.9 Hz), 7.44-7.37 (3H, m), 7.32 (1H, td, J=7.5, 1.7 Hz), 7.24 (1H, d, J=2.9 Hz), 7.15 (1H, td, J=7.4, 1.2 Hz), 6.97 (1H, d, J=8.0 Hz) 6.89-6.81 (1H, m), 6.61 (1H, dd, J=7.7, 4.9 Hz), 6.48 (1H, s), 5.18 (1H, s), 2.60-2.32 (4H, m), 2.17-2.08 (1H, m), 1.93-1.84 (1H, m), 1.48-1.21 (9H, m); LC/MS [M+H]: 563.

Provenance & Evidence