Reaction Steps
2-(2-Isopropyl-2H-[1,2,4]triazol-3-yl)-8-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene (0.20 g, 0.49 mmol), 4-trifluoromethanesulphonyloxy-piperidine-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl ester (0.29 g, 0.75 mmol), potassium acetate (0.12 g, 1.22 mmol), Pd(dppf)2Cl2.DCM (0.04 g, 0.05 mmol), DME:IMS:water 7:2:1 (5 mL), were sealed in a microwave vial and heated by microwave irradiation at 120° C. for 10 min. The reaction mixture was cooled to RT, water and DCM were added, the organic layer separated, washed with water, dried (Na2SO4), filtered and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 0 to 5% methanol in DCM) to give 4-[2-(2-Isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulen-8-yl]5,6-dihydro-2H-pyridine-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl ester (239 mg, 91%). 1H NMR 300 MHz (CDCl3) δ: 8.49 (1H, d, J=8.30 Hz), 7.87 (1H, d, J=0.64 Hz), 7.64 (1H, s), 6.92 (1H, dd, J=8.31, 1.80 Hz), 6.84 (1H, d, J=1.77 Hz), 6.00 (1H, m), 4.49-4.47 (4H, m), 4.27 (2H, s), 3.62 (2H, t, J=5.69 Hz), 3.57 (2H, s), 2.50 (3H, s), 1.59 (6H, d, J=6.63 Hz), 1.51 (9H, s).
