Lactic Acid → 2-Hydroxy-1-(3-{4-[2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulen-8-yl]-pyrazol-1-yl}-azetidin-1-yl)-propan-1-one

Participants

Reaction Steps

3-{4-[2-(2-Isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulen-8-yl]-pyrazol-1-yl}-azetidine-1-carboxylic acid tert-butyl ester (2.2 mmol) was dissolved in 5 mL of methylene chloride and treated with 2 mL of trifluoroacetic acid. After 2 h, aqueous workup and concentration of the organics gave the crude deprotected azetidine as a colorless solid that was used in the next step without purification. Crude 8-(1-Azetidin-3-yl-1H-pyrazol-4-yl)-2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene (190 mg) was dissolved in 3 mL of THF and treated sequentially with DIPEA (0.23 mL, 1.3 mmol), lactic acid (0.10 L, 1.3 mmol) and HATU (333 mg, 0.88 mmol). After 2 h at room temperature, aqueous workup and extraction with ethylacetate gave a crude solid that was purified by reverse phase HPLC to give 345 as a colorless solid (35 mg, 16%). LCMS: 506.2. 1H NMR (400 MHz, DMSO) δ 8.47 (d, J=2.3 Hz, 1H), 8.33 (d, J=8.3 Hz, 1H), 8.11 (s, 2H), 7.48 (dd, J=8.3, 1.7 Hz, 1H), 7.36 (d, J=1.7 Hz, 1H), 5.84 (m, 1H), 5.28 (m, 1H), 5.23-5.17 (m, 1H), 4.80-4.69 (m, 1H), 4.60-4.50 (m, 1H), 4.39 (t, J=5.0 Hz, 2H), 4.34 (m, 1H), 4.22-4.12 (m, 2H), 3.45 (t, J=5.0 Hz, 2H), 1.56 (d, J=6.6 Hz, 6H), 1.23 (d, J=6.7 Hz, 3H).

Provenance & Evidence