Toluene-4-sulfonic acid 2-(2-biphenyl-4-yl-methyl-oxazol-4-yl)ethyl ester → HCID 12966849, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-(5-hydroxy-biphenyl-2-yloxy)-2-methyl-propionic acid (80 mg, 0.26 mmol), toluene-4-sulfonic acid 2-(5-methyl-2-biphenyl-4-yl-oxazol-4-yl)ethyl ester (0.22 mmol) (see Ex. 1, part F), and 1,5,7-triazobicyclo[4.4.0]dec-5-ene bound to polystyrene (200 mg, 2.6 mmol/g resin, Fluka) was diluted with absolute EtOH (2 mL) and was heated at 65-70° C. for 20 h. The warm mixture was filtered through a cotton plug, and the resin was washed with EtOH (2 mL). The combined filtrates were treated with aqueous 5N NaOH (0.3 mL), heated at 55° C. for 1.5 h, cooled to ambient temperature, and concentrated in vacuo. The residue was treated with ice water (1 mL) and acidified with 5N aqueous HCl (0.5 mL). The mixture with CH2Cl2 (1 mL) was transferred to a ChemElute cartridge (3 g) and eluted with CH2Cl2. The eluent was concentrated to crude product which was purified by mass guided HPLC to afford a white foam. 1H NMR (400 MHz, CDCl3) δ1.26 (s, 6H), 2.44 (s, 3H), 3.10 (t, 2H, J=5.9 Hz), 4.28 (t, 2H, J=6.1 Hz), 6.81 (dd, 1H, J=2.9, 8.8 Hz), 6.86 (d, 1H, J=2.9 Hz), 7.01 (d, 1H, J=8.8 Hz), 7.30-7.48 (m, 8H), 7.63 (d, 2H, J=7.3 Hz), 7.70 (d, 2H, J=8.3 Hz), 8.11 (d, 2H, J=8.3 Hz); MS (ES) m/e [M−1].

Provenance & Evidence