2-(5-Methyl-2-phenyloxazol-4-yl)ethyl 4-methylbenzenesulfonate → (R)-3-{4-[2-(2-phenyl-5-methyl-oxazol-4-yl)-ethoxy]-phenyl}-2-methyl-2-phenoxypropionic acid ethyl ester

Participants

Reaction Steps

(R)-3-(4-hydroxyphenyl)-2-methyl-2-phenoxypropionic acid ethyl ester, shown below, from Example 1, Step C, and toluene-4-sulfonic acid 2-(2-phenyl-5-methyloxazol-4-yl)-ethyl ester were reacted, as described in Example 1, Step D, to provide (R)-3-{4-[2-(2-phenyl-5-methyl-oxazol-4-yl)-ethoxy]-phenyl}-2-methyl-2-phenoxypropionic acid ethyl ester, shown below, as a colorless oil (61%). 1H NMR (300 MHz, CDCl3): δ 7.96 (m, 2H), 7.41 (m, 3H), 7.19 (t, 2H), 7.12 (d, 2H), 6.93 (t, 1H), 6.82 (m, 4H), 4.20 (q, 2H), 4.18 (t, 2H), 3.23 (d, 1H), 3.06 (d, 1H), 2.95 (t, 2H), 2.37 (s, 3H), 1.33 (s, 3H). MS [EI+] 486 (M+H)+, [EI−] 484 (M−H)+.

Provenance & Evidence