(S)-ethyl 2-tert-butoxy-2-(7-(4-chlorophenyl)-5-methyl-2-(1-methyl-3-(1-methyl-1,2,3,6-tetrahydropyridin-4-yl)-1H-indazol-6-yl)benzo[d]thiazol-6-yl)acetate → (S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-5-methyl-2-(1-methyl-3-(1-methylpiperidin-4-yl)-1H-indazol-6-yl)benzo[d]thiazol-6-yl)acetic acid

Participants

Reaction Conditions

Reaction Steps

A flask was charged with 5% w/w Rh/Al2O3 (20 mg, 9.6 μmol), (S)-ethyl 2-tert-butoxy-2-(7-(4-chlorophenyl)-5-methyl-2-(1-methyl-3-(1-methyl-1,2,3,6-tetrahydropyridin-4-yl)-1H-indazol-6-yl)benzo[d]thiazol-6-yl)acetate (22.3 mg), and EtOH (absolute, 2 mL). The reaction was evacuated (vacuum) and backfilled from a balloon of H2, then stirred vigorously at 23° C. for 2.5 h. At this point, the reaction was treated with THF (1 mL), and 5 M aq NaOH (1 mL), then heated to 100° C. for 30 min. The reaction was cooled to 23° C., and filtered (0.45 micron teflon syringe filter). The filtrate was purified by reverse phase HPLC, eluting by 5-100% acetonitrile in H2O with 0.1% TFA to give the desired product. LCMS-ESI+: calc'd for C34H37ClN4O3S: 617.2, 619.2 (M+H+); Found: 617.4, 619.2 (M+H+). 1H NMR (400 MHz, CD3OD): δ 8.22 (s, 1H), 7.98-7.78 (m, 3H), 7.71 (d, J=8.4 Hz, 1H), 7.65-7.57 (m, 3H), 5.28 (s, 1H), 4.13 (s, 0.5 H, minor diastereomer), 4.09 (s, 2.5 H, major diastereomer), 3.73-3.60 (m, 2H), 3.54-3.37 (m, 2H), 3.29-3.18 (m, 2H), 2.97 (s, 2.5H, major diastereomer), 2.94 (s, 0.5H, minor diastereomer), 2.64 (s, 3H), 2.45-2.31 (m, 2H), 2.28-2.06 (m 1H), 0.99 (s, 9H).

Provenance & Evidence