Sodium Hydroxide → (S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-5-methyl-2-(2-(3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)pyridin-4-yl)benzo[d]thiazol-6-yl)acetic acid

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of (S)-ethyl 2-tert-butoxy-2-(7-(4-chlorophenyl)-5-methyl-2-(2-(3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)pyridin-4-yl)benzo[d]thiazol-6-yl)acetate (17.1 mg, 0.027 mmol) in THF (1.1 mL) and methanol (1.1 mL) was added 1N NaOH solution (0.8 mL, excess). The reaction mixture was stirred at 50° C. for 2 h and then purified by reverse phase HPLC, eluting by 0-100% acetonitrile in H2O with 0.1% TFA to give (S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-5-methyl-2-(2-(3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)pyridin-4-yl)benzo[d]thiazol-6-yl)acetic acid. LCMS-ESI+ (m/z): [M+H]+ calcd for C32H28ClN4O5S: 615.2; found: 615.2. 1H NMR (400 MHz, CD3OD) δ 8.74 (d, J=4.8 Hz, 1H), 8.61 (d, J=2.0 Hz, 1H), 8.43 (s, 1H), 7.99 (d, J=2.0 Hz, 1H), 7.94 (s, 1H), 7.91 (dd, J=5.2, 1.6 Hz, 1H), 7.71-7.68 (m, 1H), 7.62-7.59 (m, 3H), 5.28 (s, 1H), 4.72 (s, 2H), 2.63 (s, 3H), 0.97 (s, 9H).

Provenance & Evidence