Triethylamine → HCID 51354523, compound

Participants

Reaction Steps

Example 75 was prepared via the process of Scheme 1, step 3, Method—B, supra, as follows: 2-Phenylethynyl-thiazole-5-carboxylic acid (0.100 g, 0.436 mmol) in tetrahydrofuran (1.7 mL) [Intermediate 1] was stirred, and N,N′-carbonyldiimidazole (0.079 g, 0.49 mmol) (Fluka Chemie AG) was added in one portion at room temperature. The mixture was stirred for 60 minutes and then 4-piperidone monohydrochloride (0.241 g, 1.78 mmol) (3B Pharmachem (Wuhan) International Co., LTD (Libertyville, Ill., USA)) was added, followed by the addition of triethylamine (192 uL, 1.38 mmol). The mixture was stirred for about 2 hours and was worked up by diluting with 25 mL of EtOAc and washing with 2×10 mL of 1.7% aq. HCl, 1×10 mL of water, 3×10 mL of 1.0 M K2CO3, and 1×10 mL of brine; dried (Na2SO4), and concentrated to give the title compound, 1-(2-phenylethynyl-thiazole-5-carbonyl)-piperidin-4-one (55 mg; 41%), as an off-white solid. 1H NMR (300 MHz, CDCl3) δ 8.04 (s, 1H), 7.63-7.59 (m, 2H), 7.47-7.32 (m, 3H), 4.03 (t, J=6.3 Hz, 4H), 2.59 (t, J=6.3 Hz, 4H). LC/MS (Method 1), RT=1.05 min. Calculated [M+H]+=311; Observed [M+H]+=311.

Provenance & Evidence